No, why would you? It would probably be seen as somewhat rude but harmless at worst, similar to e.g. making fun of Rick and Morty fans or making fun of people who dress like it’s still 1969.
I would because it's discriminating someone by their identity and not necessarily their merits. By your reasoning, does is it only rude for Christian employers to discriminate against Muslims, for example? Someone can declare themselves to be of a religion they don't actually believe, but that doesn't mean that we should accept a society that fractures itself based on arbitrary lines of identity. Would you want to live in a society where you have a public race, a public religion, and a public gender while being intimidated to hiding your private identity for the sake of employment or so much as eating at a restaurant? (assuming one could change those things at will)
Perhaps there shouldn't be specific protected classes, but I do not agree that the mutability of a person's traits should open them up to systematic discrimination.
Being a Rick and Morty fan or dressing unfashionably are generally not considered valid identities by most people, although I'm sure many who have such interests would say those things represent their identity.
Anyway, I'm sorry for dragging race issues into a thread about GitLab. xD
