It should definitely be allowed, but the poster should also expect many to react in disagreement.

Myself, I think anyone calling Summers sexist for his comments is incorrect. But I also think Summers is incorrect in his conclusion, that the biological difference between the sexes is not great enough to be a cause of the low enrollment discussed.

Maybe we should all play a game of rationalist taboo with the words "sexist"... and another game with the word "insensitive"...? It seems to me we all have different ideas about these and related concepts. Maybe this could be a helpful response to offenders and offendees in the future-- whenever and whyever it pops up.