Acting like his momma and yelling at him in public.

The last thing you want is to look like a scorned child in public. You’ve been railing against that feeling since you were 13 years old. If you’re out in a public setting and your girlfriend attempts to correct your behavior with utter disregard to the surrounding scene, you’re smack dab in the middle of a dating deal breaker. She’s not your mother and you’re not her child. You’re equals in a relationship, although she apparently doesn’t think so. Whatever she wants to say to you, she should say in private and discuss it like adults. To scold you in public is right on the fast track to relationship disaster.