The only people that Democrats think they are better than are racist Republicans. The only case of this I've ever seen is for situations like that. Yes, they think they are better because their policies don't actively seek to hurt women and people of color. Now, now. Not every Republican policy does that, and yes, there are many Democrats equally as racist. I'm just trying to explain where this stereotype might come from.
I think it really does stem from that. If you don't think women should have equal rights to men, yes, you should be looked down on. If you are racist, yes, you should be looked down on. Republicans like to do and say the most awful things and then they are mad when liberals take the high road. Snowflakes, I tell you.