"Social Justice Warriors."
And that's exactly the thing: people can't tell you how to dress, it's your own damn business, but you are aware and understand that some people might consider and call it slutty. If you still do it despite that, you're accepting that consequence, which is fine and great. The issue is when you want to do that and dictate that other people can't consider or state their opinion that you're dressed as a slut. It might not be their business, it might be rude, but deal with it, seriously. Your right to dress or act as you want doesn't overrides their rights to express how they feel about it.