nag-drag

Someone who nags other people repeatedly about petty things in a tiresome way.

Allison: You're wearing that? Nobody thinks that's cool.

Hannah: Nobody cares but you.
Allison: You are so uncool! You should have clothes like mine. You have no sense of style. You don't know what's cool. Everything you wear is lame. Why are you so lame? (continues talking with no self-awareness)
Terri: What a nag-drag!