There does seem to be a lot of bad blood between the two.
There seems to be a profusion of religious clique threads that are a minefield to the un-elect.
Make the ignorant mistake posting on one of these threads and the Religious Police show up with Guns drawn.
The bad blood seems to come in when a non-catholic posts on a catholic clique thread because the catholics refuse to debate on other threads.
Then the non-catholics posts all get pulled and the catholics commence personal attacks against the non-catholic poster who is then unable to reply.
There may be more to it than that, but thats the way it looks to me.
Arguing FAITH is silly; and since no one is going to change his/her beliefs over the threads, they seem counter-productive--unless the "product" is self-gratification.