That's not what racism is though. A lot of people in this thread seem to think (or at least that's what they are projecting) the only racism is systemic or institutional racism. Individually any single person or group of persons can be racist against literally any racial group or social minority or majority. It doesn't really matter who or what it is.
Systemically, yeah it's kind of ridiculous to think that there will ever be widespread systemic racism against white and/or heterosexuals. That could only happen in a system where those aren't the majority or predominantly powerful race or sexual orientation.
But the concepts of racism isn't confined to one or the other. Just the application.