Gambit peed on my coworker

[StillandSilent]

Remember how proud I was the Gambit has finally figured out how to lift his leg instead of squatting like a girl? Yeah, not so much right now. He decided to cock it on a coworker at the daycare today.

Why would he do this? Of course the coworker (who has been nicknamed Ceaser Jr., if that gives you any idea of what an #$#&# he is), gave me a long spiel about dominance and alpha rolls and blah, blah, blah.

Three things are probably important here.
1) This coworker is never allowed to be unsupervised with my dog. I dont' trust him at all and Gambit is usually afraid of him.
2) Gambit is incredible at picking up on who I do and do not like.
3) Gambit has hit the 'terrible two's' something fierce, and is generally being a cocky little *******.

My guess would be the reason has to do with some combination of the above factors, but which one?

This was a deliberate marking, not a nervous piddle or even a 'my bladder's full and you're then nearest upright object.

I'm not terrible concerned about fixing the behavior, since he's never done it to anyone else, and I think getting peed on is rather fitting for Ceaser Jr. (Hey, I never claimed to be a nice person), but I am curious about why he would do this.