So it was, in fact, unironic, sardonic humor. And not ironic self-referential humour. For it to be irony you need to mean something other than what you're saying. Had you been laughing both with AND at it it would have been ironic sardonic humour.

But I'm sure you knew that. You're very smart after all. Your mean behaviour proves that you are highly intelligent, by asserting your higher intellectual status than others.

/\ Can you guess what kind of humour that* is?

*and this

When I get negative feedback on my communication style, I'm loath to assume that it's only the speaker who feels that way; of those who perceive a particular problem only a small minority will speak up.

FYI, there are several people who've commented here who claim to have trouble posting comments due to anxiety about the sort of feedback they'll receive.