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For me, it's the words "brat" and "bratty". I don't care if you're a Military Brat, even hearing the word in a benign context (i.e., not an old crank justifying the hatred of children) makes me feel like all the blood is rushing to my head, and my eyes instantly fill with tears. I do try to control myself in such situations. I know Ye Olde Military Brats wear your label with pride. You can have your Brat Tamer kink, but never talk to me about it. Even if I'd ordinarily agree that a kid is rude or badly behaved, I'd choose any other word that'd work. And the whole Brat Summer thing is almost funny, but it's had me cringing hard. For some reason mentioning Bratz dolls is fine. (I was never into them, but I understand the context is just about toys.) Even seeing "brat" and "bratty" in print feels either like I suddenly can't read, or like a slight jumpscare. I also dislike "twerp", "twaddle", and "whore".
I have misophonia and logomisia...