@Debra300 I agree. Not feeling okay about accepting a reservation from someone who thinks that a profile photo of themselves in scanty attire, holding a gun, giving the finger to the camera, is conducive to being seen as a suitable guest, has nothing to do with discrimination, and I would be extremely wary of a booking from that person regardless of their sex, race, nationality, etc.
It just indicates a certain level of cluelessness or simply not caring how they are perceived, that is likely to extend to other aspects of their booking and stay.
We may walk around our own homes naked, but we don't go answer the door in that state of non-attire. We may favor short-shorts and a bikini top when going on a picnic with friends, but we aren't going to present ourselves like that when applying for a job as a daycare teacher. We may jokingly give our brother the finger when he razzes us about something, but we don't do that to the grocery store clerk because she tells us to have a nice day when we are in a bad mood.
Discrimination has to do with our attitudes towards a person based on the things about them that are part of who they are- the color of their skin, their sexual orientation, their disability- it has nothing to do with how they choose to present themselves.