I'm going to hang up on my friend
Why would you hang up on them?
Because I will always hang up the phone
You may not like the conversation and it's fine, but it can be hurtful to hang up on them all the time. If you are unhappy with a conversation, you should express your discontent honestly instead. Communication is the only way to save some relationships.
Don't tell me what to do. I don't like people trying to control me.
I am not trying to control you, just suggesting that it might be nicer to say goodbye instead of hanging up without it. It will be healthier for the friendship in the long run.