Boyfriend said his 'exes were "nice" during a fight while I am not', when I called him out he said he was kidding, am I overreacting?

So we were fighting since some days about some not so serious issues but all of a sudden during the time we were trying to solve it he said his exes were nice while I'm not during arguments, now that struck a nerve I don't know why I feel so bad but he did clarify that he was kidding but I just didn't feel so. And I was angry too as I wasn't really happy with what he said even if it's a joke. Then he shortly said I'm jealous. Which I denied.. I don't know what I should feel about this. Am I overreacting?

Boyfriend said his 'exes were "nice" during a fight while I am not', when I called him out he said he was kidding, am I overreacting?
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