He was faking being humble.
Sly is as arrogant /insecure as Big Louie
In the 70's, Anthony Kiedis (Red Hot Chilli peppers front man) when he was a boy/teenager had a role in Slys movie
F.I.S.T. as his son (a brief appearance), when they were in the sets/trailer little Anthony wanted to approach Sly and Sly literally told him to get the F out of his face and to stay away from him ".
In the 90's Sly was in Puerto Rico filming
Assassins "with Banderas same story, there was this kid that wanted an autograph and Sly was even meaner to the poor kid and his own "entourage" telling them not to let anyone bother him " turned out the kid was the son of the movie's producer .... Sly almost got his ass kicked .... embarrassing pathetic and sad
In the 2000, While filming
Driven in Toronto as part of the cast, there was this Latino Actor Cristian de la Fuente he's about 6'2" probably with better physique than Sly)

so, mostly during filming and promotions, Stallone didn't want to bee seen standing next to the taller guy lol ..Cristian, (a little Narcissistic and full of shit himself) was trying to get close to Sly to be part of future coming projects) as Stallone was the producer of that crappy film ...Cristian noticed how insecure his childhood idol was and somewhat disappointed to work with him ..Sly trying to look taller and avoiding him.
WoooSSHHHHHHHHHHHHHHH Adrian !