Why's that? Everyone seems to be having a little harmless fun. Burnham crying is the shows Tuvik was murdered and Sisko yells a lot and Picard solves everything with a speech and Kirk has sex with every female guest star and or red shirt deaths. It's just one of the shows things people have latched onto.
Because "if you don't like it scroll past" doesn't ring true for some. I have to wonder if on social media they rage on every comment they don't agree with - or if when they're walking about they do the same if they hear a conversation they don't agree with.