Controlling hormones when you're a teenager is out of the question. It's not as simple as when you're angry and decide to not show it(very hard for most people). Lots of hormones rush through, body can't help but do it's thing. It's a disaster. Sure you can try to ease it, chances are that will fail and not change anything.
most people (i hope) can stop themselves from trolling/bullying someone just because they dont like them
while it isnt directly related to hormones its involved
after taking a semester long psychology course i have become an expert on the subject (its a joke, haha) you can assume that most people who bully have some sort of insecurity/home issues
i really doubt that someone is going to bully just because they feel like it and were angry at the moment, hence being able to control yourself (or hormones)