Anybody can hold racist views. Plenty of black people, Asian people, Arabic people have discriminatory biases and belief against white peoples and other ethnic group.
BUT racism is mainly institutional . I could hold a racist belief against a white person, for example, as a person of color, or be against straight people, as a lesbian. But I have no power to actively discriminate against white people or straight people in the same way that white people or straight people can against me. On a micro scale maybe, I could not hire white people or straight people if I had a business but it wouldn’t actually harm those people. Racism works at a much bigger scale. It’s when most of the people in charge and most people in position of power, all across the system (political, judicial, medical, legal, etc…) are held by a certain kind of people with similar views, to the point their discriminatory beliefs can and do impact lives at a national scale.
Just about a decade ago gay people couldn’t get married in France, less than a decade ago gay women couldn’t have IVF in France and had to travel to Spain. I would have no power ever as a lesbian, to prohibit straight people from getting married or from getting access to IVF because the system isn’t built by people like me for people like me, it’s built by straight people a good chunk of which had belief that for the longest time didn’t accept people like me as citizen that should have equal right. I don’t have to remind you about everything that has happened to people of color through history at the hands of white people, but needless to say, as much as a person of color could hate white people they simply historically haven’t had the power (and still don’t) to reciprocate that level of abuse and discrimination against white people at the scale it was tolerated for people of color (and still is).
That’s why a lot of people don’t consider racism against white people as a “thing”. You are right that they are people holding racist beliefs against all races including against white people. But no black person in France has the power to make sure you can’t get married, aren’t hired, can’t procreate via IVF, are forbidden to wear certain clothes etc… people of color simply haven’t been given that level of power.
Have you listened to what’s going on in France with the whole Karim Benzema debacle where one of our most important Ministre made a completely unfounded claim that he is close to a terrorist group and that he should therefore lose his French nationality, and when asked what proof he has of his link to terrorist organization his only proof is that he tweeted for Palestine but didn’t retweet for the Terrorist attack in Aras and he went as far as saying “if Karim Benzama, finds it in him to retweet about the French teacher I will take back my claims?” I mean. Do you realize how bad that is? Do you really think people of color have the power to revoke your nationality based on you not tweeting what they wish to see you tweet if you are white? No they don’t, but in France clearly people (white people relevantly, since they are the main ones in power), have the power to do this and they are using it as we speak, and they are using it based on nothing but their own appreciation of you as a person and their own belief of what’s correct or not?
So yes, everyone can discriminate against everyone but the few who have the power to discriminate against people who do not look like them on a large scale, and change laws, and enslave people and kill massive amount of people or wipe cities off of the map and alter war conflict through their support or lack there of are few and they are mainly led by people looking a specific way (and it’s really not racist to point that out, the same way it wouldn’t be sexist to point out it’s also mainly men who vote on laws that affect women and also them who are behind most of the bad stuff that happen to them.)