Top Gear have a reputation for saying things that are Just Not On. In fact this week they made a joke about it, mentioning a long list of groups that had complained about comments in the previous week, and then proclaiming that they would never offend [single most contraversial group listed].

I'd say that calling a particular woman 'not good looking' is fairly mild for what they get up to! I suspect that none of them are particularly sexist, just as none of them actually believe that lorry drivers all murder prostitutes.