Hello! I was having a debate with a man, and he called me "darlin" during this debate. This made me uncomfortable, and when I said this, he still continued to call me darlin. I feel like there was some sort of sexism lying here, and I'm trying to explain to him why (because I feel as if he was using it to undermine my opinion?) Could you help me with this?

Using “darling” or “baby” when having a serious conversation with someone is a sign of disrespect. This is a tactic that men often use when they want to undermine or disrespect what a woman is saying. 

Often times men will excuse it by saying that they “don’t mean anything by it”, but if that’s the case why don’t they call their male colleagues “darling”? 

If you told him you were uncomfortable he should have stopped. He sounds like a sexist pig.  

He might