This is true, but there's an asymmetry here, and it's best summed up by Conquest's Second Law: any organisation not explicitly right-wing will become left-wing. So in the US nowadays we have right-wing media outlets, which are right-wing, and we have everything else, which is left-wing.
Breitbart is right-wing, and Salon is left-wing, and that's fine -- people go to those sites explicitly because they want news from that perspective. It's what the readers want, and it's what they provide. But GQ is a magazine, dating back to the 1930s, ostensibly about men's fashion and suits and watches and cars and things... so why is it filled with left-wing political content and Trump bashing? It doesn't seem to be a sensible business decision, it just seems to be driven by the personal opinions of the editors.
That, I think, is what the OP means about people not being told what to believe. They don't mind it when explicitly political outlets push a political point of view, but when neutral territory (like GQ or football or Entertainment Weekly) gets politicised then that really turns off at least half the population.