I get that a lot.
I have veteran's plates and use the designated parking at certain stores. Snide comments from both men and women fly out of stupid people's mouths all the time. I ignore it. Not much else I should do.
Lowe's offers a 10% military discount and when I go to use it, the minimum wage 20 yr old pipes up with, "tell your husband thanks for his service!" Sometimes I just smile and nod, other times I'll volunteer it's my service, not his.
It's rather disconcerting even to this day, people just don't believe women should be in the military.
Oh well. Been there, done that, got the t-shirt.