My guess is that although you don't know the race/gender of the person there's a chance that they'll use a different questioning style. More senior/regular user

My guess is that although you don't know the race/gender of the person there's a chance that they'll use a different questioning style. More senior/regular users then frown upon this different style not necessarily because they're being racist/sexist just because they don't like the way the question was asked.