Since no one here was there when the questions were asked we can’t really know for sure how it could have been perceived. Usually when strangers or customers start asking personal questions like that it’s almost always not with good intentions, from personal experience, and it depends on how they’re asking. Don’t sweat it though because you weren’t trying to be creepy with them. Just know they aren’t the type to be chummy or personal with customers.

I did want to mention that a “stud lesbian” is a term reserved for masculine presenting black women lesbians. Otherwise she’s just masc or butch. But “butch” is a term that she could call herself not really a polite term for someone who doesn’t know a person well to use for them. Typically “masc” is the better term to use for a stranger that wouldn’t come off as offensive.