I Don't Like Flamboyant/Loud Men

When does not liking someone if they are too effeminate cross over into the discrimination zone? I'm not saying I would never date an effeminate person but I haven't really pictured myself with an effeminate person. I do think maybe that my dilemma could be more of me not liking flamboyant/loud types of people, however one thing I couldn't do would date a flamboyant effeminate gay. Where does this turn into discrimination?