It sounds like your roommate is using the word "queer" but not derogatory, but then again, I wasn't present so maybe it appeared differently. If you have any sense that he is uptight/grossed out about it, it could bring on problems for you to disclose. I always opt for safety, at least, physical safety. At my age, emotional safety does not concern me as much when it relates to coming out to someone, or confronting bigotry, because I feel like I have a good sense of who I am, and less bothers me emotionally. So, I would advise to always opt on the side of emotional safety, especially in a living situation.