You're damn right that's for reals. That's no power trip, it's at every level, right on up through MLB. Once you make it personal, that's it, you're lucky if you'll stay in the game if the next words aren't "just made a great call."
I've had a similar incident many years ago where a guy got tagged out at third by more than a foot, and I was on top of the play. For whatever reason, the guy who got tagged out ran back to the dugout and shouted at me from across the infield, "I don't know why it is that you've got it in for our team!"
Bam. Gone.
The dumb thing is... out of all the teams in the league, I enjoyed calling their games the most. They're a good bunch of guys, they played hard, and they rarely gave me any issues. What possessed him to say that is completely beyond me.
Guys, if you have a question about a call, fine. Hey, let's talk about it! But once it's no longer about the call, that's where we will have a problem.