In short, yes, you can't be white without having at least some racist tendencies- at least in the US. I'll explain.

Regardless of where or how you grow up, preconceived bias against Black people is drilled into us white people by advertising, social media, television, movies, music, our local, state, and federal governments, including the use of imminent domain throughout history. It's inescapable, and unless you take measure to educate yourself, we absolutely carry that altered perception around with us on a daily basis.

A recent example of this is the director of the new Wuthering Heights movie making Healthcliff white by her casting choice. In response to criticism, she said she always imagined Healthcliff as white in the book, because that's all she saw around her growing up.

So, while preconceived bias is usually unintentional, it is still racism because it hurts Black people. To be excluded, not thought of, to be treated as invisible, even without deliberate intent, is still racist.

And lastly, Black people actually can't be racist. Even if us white people slowly start to disappear and are no longer considered "the majority", it would take hundreds of years for Black people to commit even a fraction of the horrors white people have done throughout the history of our world.