"This has changed my son so much he is displaying behavior totally alien to him"

Well, that's a 12 year old boy for ya... alien! LOL


"a young lady threw a rubber"

I assume you mean an erasor right? Cause over here, if a young lady is throwing 'rubbers' around, she'd better be prepared to put them to good use!!!!

LOL

Serioulsy... kids are kids... Your kid sounds very familliar... These are the yeras that shape the young adult... he's gonna have to suck it up and find a way to deal with it...

Sounds to me though, like this teacher needs to get fired...