Which is the greater of American society's "ism's"? ism or Racism (or other)?

I <3 Obama. I think we have a lot of both. And age-ism. I'm 15, and I get talked down to like I'm 5, though I understand everything people talk about. I was talked down to by Kathleen Sebelius (governer of Kansas) I was choosen to talk to her from my school last year for being the best at history. And she made me feel like I was 2.