I've never felt uncomfortable or been turned away. I've encountered a couple of curious employees who were very respectful about asking me a few questions (starting with do you mind if I ask you a few questions?) and they were genuinely curious. I've had a couple say sir and then "I'm sorry ma'am". Today at the car dealership (minor recall issue + service) there was an old lady in the waiting room that gave me a look, but left me alone.