Is it okay if I tell a woman to back off at a nail salon?
Why do you want her to back off?
She's always bitching about something and she really gets on my nerves.
I get that people can be annoying, but you should be respectful of other people in public. You'll come off looking like the bad person if you go off on her.
She's so annoying, she's giving me a headache. I'll tell her off and humiliate her in front of everyone.
Try not to make a scene in public, you could try ignoring her and see if she stops. You could also try reporting her behavior to the manager and have them see if they can calm her down.