I'm going to yell at my classmates after we had an argument on a class hike
Why do you want to yell at your classmates?
Because I have to have the last word.
Arguments can be frustrating, but it doesn't help anyone when arguments resort to yelling. Before you get too mad, you should take some time to cool off, then see if you can talk things over with your classmate in a civil manner.
I'm going to have the last word and it's fine if he doesn't like it.
Getting the last word in isn't how you win an argument or prove your point. You should try to express yourself calmly to your classmates in a way that will persuade them to see your side of it.