I'm gonna push people who are trying to get off this airplane.
That's rude. Why would you push around strangers?
Because they are being slow and I need to get through!
I understand that you want to get off the plane, but pushing people around to get off is not the way to handle the situation.  It will just make people angry and is liable to make a fight break out.
If anyone complains, I'll just slap them in the mouth.
Slapping someone who is angry at you because you pushed them is just going to escalate the confrontation further. Instead, don't push anyone and wait patiently for everyone to get off the plane in an orderly fashion.