I am going to stand by my basic claim that rationalists should try to build an environment where people can make statements about their perceptions of reality without fear of social repercussions.

The flip side of that is building an environment where people clearly differentiate normative claims from empirical ones. The father (I would guess intentionally) failed to do this, which is a moral failing on his part - he seems to be trying to guide his daughter into a traditional gender role, not disinterestedly providing her anthropological facts about her (assumed) future dating pool. When doing the latter, he should use more objective language and also explicitly state his moral position on the status quo.

As to making empirical statements without the fear of social disapproval, I don't think that's possible. All statements are speech acts - affecting our emotions and values - and empirical statements are no different. Trying to build a community that is tone-deaf to the implications of a technically true empirical statement like "Jews are apes" is not a particularly desirable goal. If you want to transmit empirical truths with a potentially nasty social undertone, there is no shortcut but to try your best to disavow the undertone.