Not really: until now it was mostly done as a joke, sometimes the far-right/ far-left were a bit more serious about their loathing. Now it’s way more diffused throughout the society and it’s humourless. Dead serious.
The tone hardened for sure, and it definitely wasn’t as serious as it is now or as diffused throughout society as it is now; but I’m convinced there has been a lot of dislike for American culture (ok, mainly fastfood) and disagreement of American geopolitics / warmongering for a long time now. Even if it was said jokingly, there was a truth beneath that. I don’t believe anti-america movement just came into being in just a few months or years.