Well, the flamboyant ones seem more bi-polar, or as it used to be called, manic-depressive (the old term I still find to be far more descriptive of the emotional roller coaster such types display). The non-flamboyant ones do seem to just be depressed all the time.
Well, I might not have picked up on the word "morose" but I will say, you're correct in using it.
Since way back in the mid '70's I would spend a week or two in the Florida Keys, Key West more or less. I watched the gay crowd grow and then die off in the late 80's as AIDS took'em. The saddest thing in the world is an old queer. They've lost their youth, looks and sexual desireability. And there they sat, no family, no close relationship, wanted by no one, nothing, just a sad look on their faces. At times, I actually felt sorry for them. .....but not for long. Even if you're straight, a lifetime of just meaningless sex with multiple partners will do the same thing to you.
Many of the friends I had when I lived in Sacramento had gay "friends". This seemed to be the "thing" to do in the 80's.
Because of this I met and, in some small way, got to know these gay people.
Essentially everything mentioned above is true. They are obsessed with flaunting their "gayness", and have an over-active sex drive (public displays seem the norm). They held "young and beautiful" (see man/boy garbage) up as the standard and or epitomy of life. They dropped partners constantly and were always "trolling" for more. The lifestyle is very shallow.
There is nothing sadder than old gays, that are bitter, bitter, bitter, and have no life. It really is a "dead end" in more ways than one.
I almost wonder if the drive for gay marriage is a last desparate gasp at trying to find the happiness in life that they see with straights but fail at comprehending as to why.