Can't remember where, annoyingly, but a home team did a lap of honour BEFORE their match last weekend as the away team was due to collect a trophy after.
I specifically didn't include ANY context because where you draw the line is going to differ from the guy in the next seat, the guy a few seats along who has had a few beers, the respectful away fan, the loud away fan etc.
It's also going to depend on the opposition, the importance of the match...