maybe take a night walk and just get into a deep thought about everything that bothers you and the person its portrayed too, then design in you're mind different scenarios of thinking the person, no matter how vicious it is, then scream it all out. i think that maybe after all that you'll feel little better save then once you talk to them and honestly say what's on your mind then you'll already know how not to handle it. and calmly let it all out. Because your anger about the situation will mostly be gone and you won't be as aggressive. Just a thought, i think might be good. cause i know i smile in every situation and i mean all. I've done so much that my brain thinks thats the answer and unconsciously. smiles or laughs. its sort of a defense mechanism, in a way for me. But try what i said out. if it doesn't sound too silly.