This is a gross misrepresentation. Rejection by one person (Bateson) does not count as "rejected by the scientific community". One dissent does not a consensus make -- and the "scientific community" is a community of consensus.
I can't find any details on the reason for Bateson's dissent, but it's probably significant that Bateson was a strong advocate of the "saltation" hypothesis of evolution ("hopeful monsters"), which has long been discredited. As such, it seems likely that he rejected the example on ideological grounds because, like DittoJed2, he had a personal overestimate about how "big" a speciation event would have to look.
If anything, you have it backwards -- it's Bateson's paradigm which has been "rejected by the scientific community".