You sound like me.
Walking my dog a few days ago, a feral looking young fella (20 ish) was riding past me on a step-thru. I gave him a nod and may have smirked ....
10 minutes later he was riding past me again and giving me the death stare. I smiled, he yelled "WHAT?" I said "pull ya head in mate, you're the one staring" he stopped 10 metres past me, pretty much screaming now "well why were you staring at me before?"
I replied "I said hello and was looking at your bike, mate"
Steaming now, he blurts "well FUCK OFF! is it your's?"
I started walking towards him, and said laughing "nah, it's your mum's, I reckon" .... he rode away yelling abuse