Just speculating- but if 2 of Tommy's best buds in the "Guns Family" to this day are Robin n' Fortus , and those guys had reportedly worked really hard to put a "2 guitar" version of the band together post-Bucket that everyone thought was pretty cool- he probably wasn't too thrilled to welcome in another virtuoso guitarist, with an alternate name/persona, etc. on the fly. Toss in the fact that Ron's a tough "New Yorker"-type personality (which he openly admits I'm pretty sure), and the clashes were probably inevitable.
That said, I always felt everyone seemed to be having a good time live- particularly the 2009-14 version of the band- which appeared to almost be a touring rock n' roll frat party of sorts. So credit to them there.
Lastly, don't know about bullying- but never cool obviously...