One that I didn’t know about was the pronounciation of “Arab”.

I’ve heard “air-ab” and I’ve heard “a-rab”. I thought they were both just different pronounciations. Turns out “a-rab” is offensive, and racist. I literally grew up being babysat as a kid by a family of arabs, and didn’t find this out until I was 28.

I have no memory of if I ever pronounced the word wrong around any of them, and now I cringe looking back. I must not have offended them. They always accepted me as one of their own.