> And what did they say to me?

It doesn't matter. It's not a reason to be insulting back. I'm not insulting you here, even though you're insulting me.

> And you are 100% certain it isn't? Why?

I already explained. This is trivial to test. Another commenter here also provided the more likely explanation.

> If it's so inappropriate then why did you reply?

To let you know why, so you can learn from this. When people are insulting to me, I don't just ignore it so people can walk all over me. But I also don't insult back. I explain what they're doing so they can learn to have better manners.

It's not picking "one small nit", it's standing up to abusive language and behavior ("corporate defense squad members", "gaslighting nonsense"). Please be better in the future.