If you enjoy a mag enough to read it, why would you stop simply because you disagree with one writer's article and/or opinion? Please don't tell me you don't know that Rolling Stone errs on the side of liberal, anyway. If it bothers you that much, write into the magazine. Otherwise, get over it. People have differing opinions and some of them suck. If you're not reading something you occasionally disagree with, then either you're not reading enough or you're not reading enough materials that may take you outside your norm and force you to think about another's viewpoint. That's not healthy either.
Enough rant. I don't even read Rolling Stone unless I run out of other stuff and the gf's is lying around. However, I probably rant at least once every issue I read of Time, though. Sometimes some of the writers/reporters are complete shit. The overall quality of writing and reporting has definitely lowered over the last decade. It can be seen in many publications and online.