I mean, obviously I sympathize. Hell, I hung around on /r/trueathiesm for a while, until I realized I didn't care about 99% of the posts.
It's true what you say about circlejerking and people who are intensely focused on one issue. I'm on Tumblr because there's a huge trans community on tumblr. most of them are the nicest people you'd ever meet, but occasionally one washes up who is trying to tell you that cishets (cisgendered heterosexual people, usually men as far as I can tell) are all, to a person, actively trying to destroy the lives of trans people. Like, okay, so there's some shit, and life's tough as a minority (esp. if you are a non passing trans woman of Colour, where you chance of being murdered is cited usually at around 1 in 8), but the average person gives literally no fucks about trans people, or really anyone but themselves.
But then, circlejerks also develop around topics like athiesm, or the murder of trans women, or of black men, or Missing and murdered aboriginal women (in Canada), or Social Justice in general because people don't want to engage with the topic. First they ignore you, then they laugh at you, etc, right?. They don't want to now how bad it is, or they don't want to acknowledge culpability, or they don't want their lives to change. Or, in the case of athiesm, some people just don't engage with religion at all and don't care, and are uncomfortable that you care - they have the same reaction to athiests as the do to bible thumpers.
All that said, that song can be a bit much - "i'd rather break bread with Dawkins than Desmond Tutu to be honest", for example. There's lots of reasons to have a problem with Desmond Tutu, including his culpability in the spread of HIV/AIDS in Africa through denying accessibility / making accessibility difficult to In and out condoms, but he'd still be a super interesting dude to talk to - more so than Dawkins, IMO.