In lieu of the cold shoulder, I would explain to this individual in GRUESOME detail the damage he has done to you and your friends. Then, once obfuscation is out of the way, judge his reaction:
1. aloof/uncaring: shun for the rest of the semester, or until he apologizes a minimum of three times (first time is never serious).
2. apologetic: guy didn't notice what he was doing. punch him in the shoulder for being an idiot, then forgive him 'cuz you're his friend (right?)
3. if he smiles AT ALL: kick his ass; he's no longer taking you seriously.
On another point, why are you going HERE of all places for advice? This is an internet forum.
1. aloof/uncaring: shun for the rest of the semester, or until he apologizes a minimum of three times (first time is never serious).
2. apologetic: guy didn't notice what he was doing. punch him in the shoulder for being an idiot, then forgive him 'cuz you're his friend (right?)
3. if he smiles AT ALL: kick his ass; he's no longer taking you seriously.
On another point, why are you going HERE of all places for advice? This is an internet forum.