He didnt seem very happy, let him off on a warning! An umhappy work environment makes everyone unhappy.

Definitely fire him. There is a right, and wrong way, to go about problems on a job.

It sucks because good skilled labor is hard to come across and if your son did make the job harder then you need to have your son fix the problem

Now there's a feisty one. lol It's one thing to be upset, but a whole other thing to start slamming things around on a job. Oh and it's not really a good idea to take it out on the um, Boss?