Dynasty-scans is the pretty much the best yuri site on the internet. Nice people, almost every manga and pretty nice mods.
U/yuri is great too but the people are rude there. Though no LBGT bashing is done there.
That place can be nice, I go there for the rather extensive F/F literature (books) community, but the occasional transphobia and rampant biphobia in some sub communities can be bothersome even if I'm not bi or trans. I know that it's 4chan but still it would be nice if they toned that down.