I’m not even the person who insulted you

I’m aware, the reply was still directed at you.

You’ve clearly already checked out

Yup, that’s what I just said.

maybe don’t partake in conversations you’re not going to bother to even pay attention.

You’re the third party entering the thread I created and a conversation I was having with someone else, long after I’ve clearly checked out.

Maybe don’t involve yourself in other people’s conversations and then expect their full attention.