Maybe Tully actually was a prick to JBL in Texas, athough adding up the timeline in my head I don't see where Tully and JBL would have crossed paths during that time period. Buzz Sawyer fucked over the Undertaker big time when he was breaking in and nobody said anything about it when The Taker put him in his place in WCW years later. If somebody screwed me over or fucked with me ten years ago on my way up, and a decade later the roles reversed, I would let him hear about it too.
It's actually very common in the wrestling industry for something like that to happen.