This stereotype of Vegans has always bothered me. I’ve never once in my life heard a vegan announce to a group that they were vegan unless it was relevant to the conversation.
I have heard many people complain about vegans completely unprompted, however.
I know your intentions are good but if my kid stumbled across gore or animal abuse they’re going to require a level of “talking to” that is waaay beyond my skill level, and a content blocker is a lot cheaper than a child psychologist.