Bully

I'm minding my own business at the market, headed for checkout when this guy pushing a cart starts yelling at me. Cursing actually. Never saw him before. I stopped and walked up to him and cursed right back. What are you going to do about it, he says. What are you going to do about it, I say back.
He was much bigger and probably ill. But you can't let anyone bully you ever, especially in a public space. He pushed his cart to the cafe section and tried to enlist another guy. He kept cursing, I cursed back, Everyone else put their heads down and hoped things would calm down. We'll see.
There are a lot of sick, angry people out there whose life didn't work out. We don't have to tolerate  their crap.