I think there are three definitions for racism:
one, is the belief that a "race" is "superior" to others. Two, is that that belief should lead to discriminatory laws. Three, a preference for some kind of phenotypic traits in social relationships.
I think number two is clearly wrong. However, number three is perfect reasonable. But in our society, political correctness is leading towards saying that three is bad.
For example, is it bad to prefer some kind of phenotypic trait when looking for a couple? Of course, it would be bad to say that some kind of mixed-phenotype-couples are forbidden by law. But extremist political-correctness is confusing both things, which are very different to each other.
However, we constantly choose in our social interactions, with many different metrics (often, inadvertently of that).
Even more, political correctness is leading towards suppressing natural behaviours, such as preferring your own kin, or having children. Political correctness is leading more and more to make believe to people that we should prefer others rather than our own kin (if we are white; otherwise not) and that it is cool not to have children. Note: I am talking from a European point of view.