When Cruz first called John a cheat, etc., John said he wouldn't throw stones and was, IMO, very professional in his response. He was that way all the way, up to the point that Tony got in his face and wouldn't shut up. Tony egged him on, knowing full well John's temper would get the best of him in time. Having a similar temper, I would have done the same as John. You can only put up with that kind of crap so long. Would be different if John hadn't given Tony the boost he needed to be where he is today.
The Pedregons are 'no class' in my book and always have been. I just bet John will pay the fine with pleasure. Now he needs to go out and win the championship and shut them up for good.