Friend not taking the hint I’ve slow ghosted them

A friend of mine had a long running pattern of putting me down when we were together, it finally came to a head when they did it in front of multiple people at a party. I rebutted as much as I felt comfortable without making a scene and haven’t seen them since. They didn’t apologize either. And I honestly don’t miss any aspect of that friendship

They, every few months or so, ask to hang out. I tell them no thanks every time. On one hand, I haven’t had a conversation about how their behavior toward me has been hurtful and on the other, I don’t really care to explain it to them.

I can imagine this is hurtful to my friend if they have no idea, but I also don’t feel responsible for their lack of self awareness.

Am I being unforgiving here?