Being vibed out by a couple of minimum waged boutique clerks sounds hilarious to me... I don't even know how I'd react if it would happen to me. They're a bunch of fuckin' school drop outs that sell over priced t-shirts for a living, they're definitly in no position to cool guy anybody on this earth. There's not a single job that demands less work from a human.
Just unfold as many t-shirts as possible next time...