if you end up injured while trying to get some steam off, now that would piss and disappoint many.
so gym yes, but I would put a bit lower weights, or go for some cardio
If something repeatedly causes anger or stress it might be a good idea to re-evaluate whether you need that thing in your life. Stuck in a 35-minute queue? It might be time to take your business elsewhere. Angry and motivated often go hand-in-hand.
Fix the problem, don't dwell on the emotion.
I wholeheartedly disagree with the OP of this line of commentary. Saying anger is good and one should embrace it is a really bad suggestion.
Anger makes you blind, it fogs your rational thinking and makes you do things you'll probably regret afterwards.
So, avoid it and think rationally.
The worst thing you can do is avoiding anger because sooner or later you'll explode. Learn to handle it or burn all that excess of energy on something useful but never avoid it.