As a gay man myself, I ofcourse like to hear that people want the LGBT community recognised in game.
However... A Jarvan skin with a gay pride flag would not be the way. In part the LGBT community is already established in game through Taric (and maybe VI) and some of his skins. Making a skin so blatantly obvious would not give the right message. We want to be accepted...not isolated, whether that may be through being considered "special" or "wrong"...Such an obvious skin would give the impression that we want people to think we are special and different (even in a good way) compared to anyone else...and that is not how is should be.
Edit: You don't see Lucian blatantly quoting Martin luther king or having a skin based on him...nor do you have an Ionian chamipon with a skin of Ghandi...things like this should represented in subtle ways...Just the fact that Lucian and Taric exist in game are already great steps towards accepting any and all people as they are :)