I usually stare back with a mean look - unless it's a cute guy.
Or, you can give a mean look then turn your back to them. They should get the message with that.
Or, if you are with someone, act like you're whispering to them and point at this person while they are staring at you and both of you laugh. The staring person will think you're making fun of them and should look away.
_________________
Me grumpy?
I'm happiness challenged.
Your neurodiverse (Aspie) score: 83 of 200
Your neurotypical (non-autistic) score: 153 of 200 You are very likely neurotypical
Darn, I flunked.