How to handle strangers abuse?

[VietBro]

Here are two situations:

I'm at a club and the crowd is raving moving backwards w/o ill intentions as I slowly walk backwards a guy I didn't even notice lays hand on me and forcibly shoves me towards the crowd

I'm jay crossing the a street that's in traffic at my college in a city and its a red light but a guy screams out his car "Buddy use a crosswalk".

Situations like these people looking to cause trouble, in both I automatically just rub it off and ignore. It makes me furious when thinking about the disrespect and in part I think it's bc of my race and looks they are abuse me. I know some people throw hands or at least confront, whats the most correct way to handle these ?