Racism can be towards any race. I believe that all groups are equally racist and equally targeted. I know many may say their own race are the biggest victims of racism, but I personally think it depends on geographical location.
For instance, when I lived in Philly, my family was the only white family in the neighborhood... I was constantly harassed/bullied, ganged up on, stabbed once, and at one point I had a gun pointed at me. All the girls called me white trash and rudely insisted on calling me Becky and Mary and Sara and at some points malibu barbie, (which now I actually flaunt a barbie necklace to show I don't give many ***** about my race and I'd be proud no matter what race I am or what names are thrown at me) even though that clearly was not my name. Now after enduring that, and enduring Orlando, Florida's Hispanic population being just as rude... I came to Tennessee where it is predominantly white. I was like "Oh man! Everybody's so nice here! I haven't got called any mean names yet." One night, however, I was at work stocking baby food and a white man comes into my aisle and does a crude imitation of Spanish. I ignored him, thought maybe he's entertaining himself since we get a lot of drunks and high people... but then he says "oh, you're not mexican then!" And starts doing a crude imitation of Chinese which I also ignore. He then gets frustrated with me and says "I NEED HELP!" So I turn to him and say "yes you do" and he goes "Oh, so your kind actually speaks English". Apparently, he didn't realize that I was mostly white and somewhat native american and he had mistaken me for either a Hispanic or Asian (I get that quite a lot)... I did flip out at him because their was a Japanese woman in the aisle too and she was shaking with anger or tears I couldn't tell. So I then learned that in areas where there's a significant majority different, minorities in that area will get targeted because I've also seen black people harassed in the store which I don't stand for, any kind of bullying I do not allow to happen in front of me.
The definition of racism is views, practices and actions reflecting the belief that members of a certain race share certain attributes which make that group as a whole less desirable, more desirable, inferior or superior. It has nothing to do with who has most power, although majority does determine who is more likely to get targeted... it has to do with stereotyping races and due to those stereotypes having an overall belief that they're inferior or superior to other races.
Opinion, experience, dictionary