He refused to roll over for the Dem/GOPe class, so for that he's a "runny-nosed" freshman. Rubio slaps his voters in the face and is the Golden Child for becoming a lackey. I can't stand the GOPe.
This "GOPe" is a straw man. Those of us who don't favor Trump or Cruz are hardly monolithic. We run the gamut of conservatism. We're pragmatic. We believe that winning is more important than going down in ideological flames.
As for me, I think Cruz and Rubio are both runny-nosed freshmen Senators, just as Obama was. I'd hope one lesson of the last seven years is that real experience is not valueless. But I have my doubts that lesson has been received, since the experienced, credentialed candidates (Perry, Walker, Bush, Jindal, Kasich, Christie) have all dropped out or may soon be forced to.
It's sexier to be reflexively angry, and back the candidate who gets you off.