you might be right, you should collect more data points, try this class of jokes out on more people and see how funny they find it, you could call women walking birth canals. It should be easy to formulate this comedy; take a broad category of people based on some immutable quality, like skin color, find the least charitable insult you could possibly imagine, like parasite, and see how funny they find it.

I'm ~60% sure they themselves are trying to bait someone, into an anti-abortion argument. They're definitely deliberately taking the most provocative stance possible, and trying to provoke more people along with them.

edit: re-reading their comments, I'm at least 80% sure.