I’m not excusing the yobs behaviour. The reality is though he’ll get away with it because no one knows who he is.
Vieira, because of the skill set he has, represents Crystal Palace as an institution. He is the most prominent representation of the club to the entire world. There’s a certain behavioural standard attached to that whether people like it or not, so the consequences for Vieira will be higher than the anonymous fan. Vieira knew all of that when taking the job, just as he knows that if he loses a few games he could be fired completely unfairly, that’s why the salary is so high.
It’s the same reason why MPs resign for offences that other people could carry out every weekend and get away with. Certain behaviours have to align to certain jobs and I doubt Steve Parish is sat there this morning pleased to see the manager he pays a lot of money to represent Crystal Palace losing his cool and kicking a fan.