I think responsive design is different in that the basic idea is just to reduce the number of columns as the screen gets smaller (or increase them as it gets bi

I think responsive design is different in that the basic idea is just to reduce the number of columns as the screen gets smaller (or increase them as it gets bigger). Likely the sites you are complaining about are serving up something completely different for mobile or perhaps some are going beyond what responsive design is and messing things up.