@Lilkanyon,
Not sure what my first experience like this was but the one that comes to mind where I felt it myself was in middle school. I went to a lot of different schools throughout my education. In 6th grade, I was sent to a school across town with mostly Mexican, and African american kids. I am a total mutt of all different nationalities, Cuban, Irish, Swedish, Mexican, south American, Etc. I look sorta white, but have black hair and my skin is darker than someone who is normally classified as "white".
Anyway, this experience spanned over the next several years as I bounced around to different schools. The first school, I was always talked down to for being The "white boy" or "white bread" they'd say. I would always just think "what the hell, I'm cuban, man". After that year, I was transferred to a school in the suburbs that was mostly white, There I was the "Mexican kid".
They all would call me names and steal my stuff.
All in all, I have come to the conclusion that racism is everywhere, it knows no shade of skin, or ethnic background. I was raised to be tolerant and accepting of everyone, and for the most part I am. I just have a hard time tolerating people who are intolerant of people for their appearance rather than their actions. The only thing to do is to speak up against intolerance when you come across it rather than being quiet. When I hear someone making a racist or classist comment, I like to call them out in front everyone who is around and ride them for being ignorant.