Insults given and taken

I have the impression that people think that I'm likeable and easy to get along with, so I was quite taken aback when CofU said I was "illnatured". That comment hurt, perhaps more than was reasonable, his opinion doesn't have much value, and might have even bean a misunderstanding. In return I've told him (under provocation) that he is tactless and has a thick head. I'm ashamed that I lost my cool and said these even if they are true.