No, I disagree with that completely. While it may be unusual, it's my no means non-existant.

Rejecting behaviors do not need to be learned. They can be a result of numerous causes. They're no harder to display than welcoming or accepting behaviors.

Wait til you have kids, haha. All infants behave on a spectrum, on a curve you might say, but all on a spectrum. Every baby displays some of both, and some display certain behaviors with more frequency than others.