Omg, please stay the hell away from that rude creep! He sounds unhinged & he’s probably a narcissist too.

Don’t be polite. Be very assertive & loudly tell him to go away, leave you alone & to never ever talk to you again or you’ll call the police & file a restraining order for stalking & harassing you!

Talk to the landlord. Document everything. Get a security camera. Avoid the areas he lingers around. Check your mail very early in the morning or when he’s at work.

Walk in the opposite direction if you see him. Do not talk to him period. He already thinks you’re rude already.
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Tell him to **** off loudly. If you see people around, then go talk to them & warn them about him. He’s crazy. If you see a neighbor there, try being near them so that he’ll be less likely to approach you or attack you.

Buy pepper spray & take self defense classes. Leave a bat by your door & get secure locks & a surveillance camera roo.

He sounds like a stalker. You might need to move out soon if things don’t change.