Why do kids reject other peoples opinions and beliefs?

I was 13 during the Obama/McCain election and i supported McCain. Why is it that the Obama kids were able to promote the Obama campaign with stickers and signs and such. But when I put the stickers and stuff on my binder they stole my books and destroyed my binder and ripped off the stickers. And kids liked to wear Obama shirts. but when i wore my McCain shirt i was attacked in the bathroom and had the shirt ripped right off of me. they all called me a racist for supporting McCain and they bombarded me with insults when I didnt even do anything to provoke them. and I never fought back because i am better than that. so i was wondering. why are the young Obama supporters so hateful? If i remember correctly they are against the war in Iraq but here they are being the first ones to get violent towards me. WTF! I never did anything to them and they were always the first ones to attack. They violated my fist ammendment right and several times they tresped on my property and i thought my brother was going to show them what the second ammendment is all about. seriously! WTF WAS WRONG WITH YOU *******!