We're social creatures, If I want a space without sexist shit and a culture where that kinda stuff is unwelcome, that means saying "ew, gross" when someone shows up with sexist shit. I wouldn't even care that much that its unfunny if it weren't also misogynistic.
Call me whiny all you want. I don't like sexism, and if my taking issue with it sounds like whining to you I think that says more about you than me.
It'd be nice to have at least one small corner of the internet where laughing about bigotry told through the saddest memes imaginable isnt the norm.