Rationalists like to believe that they have tossed aside all prejudices, and that the way they do things is based upon pure reason. I recall a rationalist, in the comments here, scoffing at my nod to the importance of tradition in judging the propriety of laws. At one point he asked me, "I suppose you'd be fine living in a culture that forces women (but not men) to cover their face in public, as long as that is customary?"
Of course, as Oakeshott pointed out, devising some "rational" way of behaving by starting from a blank slate, after having rid oneself of all influence from traditions of behaviour, is an impossibility. So to a student of Oakeshott it comes as no surprise that my rationalist interlocuter didn't seem troubled by the fact that he is just fine living in a culture that forces women (but not men) to cover their chest in public, because that is customary.