Did you tell them that? Don't feel bad I got fired from a job based on what a customer said too. It was bullshit just like your situation. Good luck on finding a better job with a better boss.

Ask to speak to the customer, then look him straight in the eye and say, "I wasn't flashing that gang symbol at you; I was flashing it at the sun. I am part of the Night Owl cult who shun the light of the sun as it is the mascot of our rival cult, the Early Birds, only the Caffeine cult can prevent us from destroying the Sun and allows us to walk in broad daylight." If the customer looks at you like you're nuts remind him that this makes exactly as much sense as his theory which almost got you fired.

Geez... Why are people such idiots?

This made me laugh more than it should have.

Tell him that you weren't flashing gang signs, you were trying to tell him to steal second base.

That was an uptight dumb customer. Good that you saved the job though OP.

Was he white cause it seems like he would be white just out of pure knowledge of the stupidity of some white people

You should've asked him exactly which gang he thought you were referring to

lemme guess, you live in the US?

Come on be real what set you rep?