It's very rare for me to support anger and yelling in general. But once in a while, I think it's a good thing.
I don't normally support it either, like I said, I don't really have a mean bone in my body but that was out of line and someone needed to at least attempt to straighten him out.

Good job .I bet the idiot has no clue why you yelled at him .
No, you are right he probably doesn't. But I sure hope someday the way he treats animals comes around and bits him in the butt.