Is this gaslighting?

During an argument, my boyfriend said that my PTSD and MDD (that I have never been diagnosed with) means my logic isn’t solid. I told him that I felt he was gaslighting me by saying that and he said that I really need to “learn my terminology” because gaslighting is “when you say something and the other person tries to discount it” not “pointing out the obvious, like he was”.

For context, my mental health didn’t even have anything to do with the situation. We were arguing because I told him I didn’t like that he shared a Facebook post that included something that clearly was a sneak diss at me, when we have mutual close friends added and I felt embarrassed.

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