I'm going to be vocal with a co-worker
Why are you going to be vocal with a co-worker?
They've really been annoying me and I'm tired of it.
When you are at work, it is expected that you have a good working relationship with others. If your co-worker has been bothering you for whatever reason, you should try to discuss it with him or her calmly and rationally rather than get vocal as that is very rude.
That won't work, the only option is to take action and get vocal with them.
It sounds like you're very frustrated with this co-worker, but you have to remain calm and professional. Talk with them about how their actions are making you feel. If that doesn't work, talk to your boss about this co-worker and see what suggestions they have for handling the situation.