My friend talks over other people and I'm going to tell her not to.
Do you have a reason for wanting to say that to your friend?
I'm not in the mood of tolerating his bullshit.
If you want to tell your friend this then it is important for you to make sure your tone doesn't sound rude. If you fail to tell him this in a constructive way then your friend isn't even going to hear what you're saying, but instead just get upset with how you sound.
You're right. I have to have a calm conversation with my friends and make sure he doesn't take offense to my criticism of his actions.
Approaching this in a calm manner is definitely the best way and you'll probably end with the best result this way. Your friend is going to be more receptive to your criticisms when he doesn't feel attacked.