GamerGate was the first bit of anti-left, by 2015 4chan was basically almost all right-wing, kind of an infection that spread.
May 2015. Trump didn’t announce he was running for President yet. With the soil ready, it was a perfect storm when he made his announcement a month or so later.
Anyway, one of the common trolling things to do was and is to pretend to be “the left” and do ridiculous things to get into the news.
Highlight is to get on CNN — Fox was an easy mark as they were easily tricked.
Of course a nice side effect is they’ve so convinced people on the center-right to right that liberal/lefts are capable of ANYTHING, that they can say literally anything pretending to be ‘the left’ and get away with it. Millions instantly believe what they’ve been conditioned to believe.