'One individual gathers others to participate in' - there's no co-ordination here.

I do understand that when someone does something wrong in a high-profile fashion, the result feels a lot like a mob / pile-on / bullying because a large number of people independently decide to talk about it, and that it causes more upset / suffering / harm than was necessary to fix the problem - especially in such a borderline case as 'wore a shirt without realising that it had problematic connotations when taken out of context'.

I'm not sure what we can _do_ about that without unacceptably limiting people's ability to criticise people who are in the public eye, though.