The war between the Wenger Out Brigade and the Arsène Knows Best factions split the club with only owner Stan Kroenke really standing up for the club's longest-serving and successful manager.
So, after newspaper pull-outs, special press conferences and programmes in his honour in 2016, it was down to his team to do the talking when Arsenal faced Brighton and Hove Albion on October 1 this season.
Wenger claimed afterwards he had been unaware of the special anniversary until it had been pointed out to him by a journalist.
And the 21st-anniversary match almost sent people to sleep until a brilliant second goal in Arsenal's 2-0 win featured a string of trademark Wenger passes, punctuated by an Alexis Sánchez back-heel and Alex Iwobi‘s rocket of a shot into the roof of the net.
That is the sort of football Wenger's Arsenal have been known for, even though it has been less regularly repeated in recent seasons compared to his first decade in charge.
Three FA Cup wins in the last four years is a record most managers would envy.
The Wembley win over Chelsea also made it a record seven for Wenger alone – a record for the whole history of the English game and not just the Premier League generation.
But he is still being harshly judged for his one and only failure to finish outside the Champions League qualifying spots at the end of last season.
A record FA Cup and fifth was deemed almost a failure, so high have his standards been set.
The proud manager signed a two-year contract last May, much to the equal joy and dismay of whichever faction of the Arsenal faithful people sit in.
So, he obviously thinks he can conjure up another title challenge.
Either way, he is sure to set new records in the process of trying.
Since officially joining the club on October 1, 1996, Wenger has taken charge of the second-most Premier League games of all-time on 797.
Only Sir Alex Ferguson sits above him with 810, so he should surpass his great Scottish rival this season.
He is already a clear leader if you classify non-British managers, with closest rival being Roberto Martínez, who is over 500 games behind.
His win percentage on nearly 1,200 matches in all competitions is over 55 per cent.
And, once again, only Ferguson tops that statistic with 65.2 per cent from managers who have been in the hot-seat for a minimum 300 matches.
And, just for good measure, the Brighton victory also marked the 45th different club that Wenger has defeated in the Premier League. That is a competition high.
In his first 20 years – who knows when it will end – Arsenal have won the Premier League three times, finished runners-up six times, come third five times, fourth six times.
As hinted above, the problem is that most of those big titles were stacked into ‘Wenger The Early Years.'
Between 1996/97 and 2005/06, the year they reached the Champions League final, Arsenal won 11 pieces of major silverware.
Though not bad going for most clubs, that compares to just five from 2006/07 onwards.
And aside from being remembered as the man who changed the face of English football with his then-revolutionary approach to training and diet, he will also be feted for his achievements on the pitch.
His Arsenal side went 49 matches unbeaten between May 2003 and October 2004, picking up the title unbeaten along the way.
The 50th match was one of many infamous Arsenal battles at Old Trafford, except this was the one where it ended in a mass brawl and Cesc Fàbregas coating Fergie's face in pizza.
Where 50 is a more significant number for Wenger relates to the number of north London derbies he has overseen.
And from that half-century he has a proud record of 22 wins, 20 draws and only eight defeats.
With 461 Premier League wins, it is a long shot that he will surpass Ferguson's 527-mark at United.
But it is even less likely that whoever eventually succeeds him at Arsenal will beat his Premier League points record, which stood at 1573 going into the October international break.
And to conclude with a couple of tables, there is not a current manager in the top flight who comes close to Le Boss in terms of longevity.
In all of the top four leagues in England, he is ahead of second-placed Paul Tisdale, of Exeter City, by almost a decade.
Premier League managers
MANAGER CLUB JOINED TIME IN CHARGE
Arsène Wenger Arsenal 1.10.96 21 years
Eddie Howe Bournemouth 11.10.12 5 years
Sean Dyche Burnley 30.10.12 5 years
Mark Hughes Stoke City 30.05.13 4 years, four months
Mauricio Pochettino Tottenham 27.5.14 3 years, four months
Tony Pulis West Brom 2.1.15 2 years, 10 months
Slaven Bilić West Ham 9.6.15 2 years, three months
Jurgen Klopp Liverpool 8.10.15 2 years
José Mourinho Man United 27.15.16 1 year four months
Ronald Koeman Everton 14.6.16 1 year, three months.
Wenger has been around for so long he now has players in his squad who were not even born when he took over.
And for all his winners and losers in the transfer market, he has often had an eye for a player who knows where the back of the net is.
Three of the top ten Arsenal scorers during his reign are still playing for the club this season, although Thierry Henry stands alone as both his and the club's greatest ever goalscorer.
Wenger's Top Ten Goalden Greats
Thierry Henry 228 goals
Robin van Persie 132
Theo Walcott 107
Dennis Bergkamp 102
Olivier Giroud 100
Robert Pirès 84
Alexis Sánchez 73
Freddie Ljungberg 72