I see your point, but in the end and in his bigoted, small-minded way, he just picked insults for their intended maximum impact, but then, so did Cordelia, who fought back. Interestingly, Buffy dressed much the same way, and he obviously knew it. As to "learned behavior," I'm sure you're right, but that is often cited as an excuse for his boorish behavior. It was surely a factor but not an excuse.