I have never been shunned in a group and as many here, I've been doing alot of LFD grouping.
The only thing that happens somtimes is getting declined in the LFD tool.
And lets be reall here, that's just because you're one of 5 players -- rough average -- applying to join an LFD group.
If for some reason you cannot find yourself being accepted into a group: create your own.