Baltimore City: Bad neighborhoods are just that, ppl there don't have picks so if something happened (assault/robbed/etc) it would be wrong place wrong time or you got lined up but super rarely to basically never have I heard of ppl being preyed on due to hatred towards gays. So pretty much pick a spot that fits your criteria and move there. Forget even worrying about any anti-gay sneers, people don't care. If you want to specifically be in a gay neighborhood than Mt. Vernon or any of the others suggested would be good. If not just pick a cool part of town you like and your good.

Baltimore County: Assuming very similar.