What’s sealioning?
it’s when you’re discussing how much you hate all members of group A and a person from group A is like “hold up, what?”
Okay, I laughed at that one.
To answer OP, the term is one of those SJ terms that is so easily prone to abuse that it’s poor epistemic or political hygeine or something to use it, because it can basically be used to dismiss the outgroup defending themselves.