My gf has a Prius

 and I drive it from time to time. Every time I pass someone else with a Prius I wave to them and they always look at me like I'm an idiot. You would think that people that buy a Prius would have some sense of comradery towards others who buy a Prius but there is none whatsoever. It is almost like they are saying "by waving to you I am not being efficient and I think you are a moron." Come on Prius drivers, where is the love??!!