You're making a common mistake seen in these discussions by creating a tautology by defining "hitting on" as always a gross violation of hospitality. Or something that obviously makes someone uncomfortable.

Let's not forget that hitting on someone is a continuum that ranges from flirtatious banter that you can enjoy with anyone to one's twisted idea of what hitting on someone entails that makes all their guests uncomfortable. Like asking "wanna fuck?"

Yes, hitting on someone in a way that makes them uncomfortable does make them uncomfortable and makes you a bad host. But I worry that you have an unhealthy understanding of flirting if you don't think it's something you or anyone can do without making someone else uncomfortable.