I've played WoW for many years(Vanilla -> Cataclysm).
I can definately say that Swtor has a more manture community,.
Simple math. WoW has more subscribers so there is simply a greater chance of running into trolls ((and not just the race :-) ))
I remember recently I ran an SM EV. Someone made a small mistake on the final boss that eventually led to a wipe. Now if the group had retried again there was no doubt victory was assured since the mistake was easily corrected and the group was certainly strong enough to win. But nope, someone had to take the loss so sorely and troll everyone that the group fell apart one small step away from a successful run.
That kind of behavior is definitely as bad as any of the raidrage I have witnessed in all my 6 years of WoW playing.