It's become the habit of leftist spaces since the first sign of the poisoning of a space by the right is usually in the humor. The cycle of "Oh I was just saying this racist thing to be edgy, I didn't mean to be serious!" to "Oh you're too sensitive you're ruining everyone's fun" to driving vulnerable minorities out of spaces because it's just bloody toxic to explain when something is sucky and courting vicious attacks for being "political" when trying to stick up for themselves thus making what remains hotbeds of ever deepening unironic racism/sexism/queerphobia etc... Yeah. It does mean that any spaces with leftists left in them tend to be very corrective in the way they engage with memes and jokes.

I suppose it's a little of a "this is how you get ants" situation in moderation.