> I think if an employee can't handle simple constructive criticism or clarifications maybe they should not be employed.
and then
> I was encouraged to use "y'all" [..] I thought that was a bridge too far.
I wonder if there might be a small bias on your part. The criticism you deem constructive everyone shall endure, but the other criticism you deem a bridge too far you yourself shall not endure.
There’s a difference between feedback regarding your work and language policing something like “you guys” which some people have just suddenly decided is offensive as of 2016 or so because I guess we’ve already solved the rest of sexism.
Because he was saying “hey guys “ naturally without thinking twice.
Now you make him think twice about what he’s saying, of course he’s going to nitpick everything.
Somehow you missed: Not all critiques are equally valid or valid at all.
and then
Somehow you missed: They did deal with it. The one they criticized did not.
The original story about not handling criticism well was someone crying after a kind question, not merely saying something was a bridge too far. (FWIW if I saw someone cry once, I would consider it might be a one-off due to stress at home etc, not necessarily a constant personality trait I'll have to deal with regularly.)