Just get over it, okay? Especially if it's inconveniencing you. Many times it's more work to maintain the bias than to find the workaround for it.
Here's my example:
The fluff & fold laundry nearest my home is staffed by a couple ladies who are really a bit odd. They violate the (previously) unwritten law: We'll both pretend that the launderer does not see my dirty clothes.
They once asked my boyfriend if he had a girlfriend because "There are ladies clothes in this bag with yours". Um, it's the Castro folks, maybe they're his.
Worse than that nosiness, though, they'll even ask about stains. Now that's really beyond the pale. Er, so to speak.
So, even though the nearest laundromat is about 4 long blocks further away, I stopped taking my stuff to the fluff & fold at the bottom of my hill. Even when the last thing I feel like doing is laundry. Even when I'm crazy busy and it would be so worth it to pay someone else to take care of this stuff.
The solution is simple: just don't give them anything I'd be embarrassed to be asked about.
I hope they like my "Colbert Has Stones" t-shirt.