Why would a person talk shit about me and don’t know me yet say good morning to me?

I don’t know what’s up with people but they’re fake af and toxic. A stranger who don’t even know me and said shit about me YET had the nerve to talk shit about me. Opinions don’t bother me and who don’t like me I couldn’t careless about however when you have the audacity to say hello to me knowing I know you don’t like me that’s a problem. Like you can’t play both sides either you fuck with me or you don’t. The crazy part is it’s a grown ass old ass washed up man around my father age, like yikes. But yeah keeping my distance cause I don’t fuck with snakes, male or female. I’m glad I know he’s the enemy and showed me that side so I know what type of shit he’s on.
Why would a person talk shit about me and don’t know me yet say good morning to me?
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