well, first of all you could try to play more SP/non-competetive games/genres - it's not only since COD and the like that (esp. competetive) online gaming "communities" have a habit of raging like there's no tomorrow.
if you still want to play competetively, do so with at least a number of pals, esp. when playing MOBAs (good lord, people there make FPS-player seem like actually likable persons ^^ ) - that makes it easier to play for, you know, fun - and yes, that even works playing LoL! LoL, of all games! even ranked, even when losing one can still have a good time.
and there's always the mute button, and the possibility to switch servers or whatever, so... yeah
last thing i can think of for now is: why should we give you reason to keep on gaming? yes, we all like gaming. but it's ok to not like sth. anymore from some point on - i am pretty much at the same point as you (except for pondering quitting for good perhaps), but i play only so many hours per month for years now, mostly SP, and mostly indie titles (which often are shorter, which goes well with playing only a bit), so i think i can relate to that, to some extent.
my gaming changed due to a number of influences: work, uni and other "RL-stuff", new hobbies etc. (i guess that's just what happens when you grow a bit older - shifting priorities), and - of course - the FPS (although i do love me an evening/night of Planetside 2 every once in a while
) and MOBA communities. and MOBAs need you to play fairly regularly to stay up-to-date and perform at least ok (there's no crime in losing, but i myself prefer being able to play at least acceptable)
if you don't like something anymore, don't try to force yourself into it. that doesn't sound like a good idea to have fun.