I'm going to yell at my professor, is that ok with you?
Why would  you want to yell at your professor?
Because I hate him for being a bad teacher
It is frustrating to have a teacher that you are not learning from but yelling is not the answer to that. It is good to talk to them about what problems you are having with them so that you can see if you should stick with the class. Otherwise it is okay to switch to another professor. Yelling at the professor will just hurt his feelings.
Fine, I guess I can be respectful. I didn't realize that it hurt his feelings.
Yelling at people does hurt their feelings because it makes them feel attacked. Professors are there for you to help you learn so it is good to be respectful towards them.