Hm, I do think the remark is legitimate and I don't see why it should be seen as an isult.
As far as I know, in the academic world MBTI is not taken seriously. It is a system that should not be seen as scientific. It is not. This is where I agree with Victor.
However, it offers a useful frame to think about human differences and diversity and it may offer a good startingpoint for introspection. In this way it does have practical value. Amen to Xander
Even though Victor's statement was quite provocative (especially the last two paragraphs), I don't see why it should be a taboo here.