Fallon, host of the
Tonight Show - the world's longest-running talk show once hosted by Jay Leno - was accused by social media users of "showering a racist with love" after he frolicked around on TV with the man who has become an international
poster boy of the far right.
That Trump believes Muslims should be arbitrarily banned from entering the US, or that he once referred to Mexicans as "rapists" could all too easily be lost on some who watched as Fallon sycophantically cackled to Trump's jokes and personal anecdotes.
This was perhaps easy for Fallon - a man who is neither
Mexican nor Muslim - to do so with such obliviousness. Thankfully, however, social media users were ready as ever to remind the TV host of his privileged position.
"That feeling when Trump doesn't threaten your livelihood" read one tweet captioning an image of Fallon gleefully rubbing the 70-year-old's thinning head of hair.
The moment that Fallon ruffled Trump's malting mop of hair was the climax of the display.
At the same time, this was possibly the point in the show that left many wondering how Fallon could be so heedless - even as his fingers ran through the thin blonde whisps that keep Trump's baldness as well hidden as his
racism.
"
Was Jimmy Fallon supposed to do a hard-hitting interview? Of course not. Was he supposed to shower a racist with love? No. Not that, either," tweeted another user.
Those who took to their keyboards to express their disgust were not in the outraged few, either.
According to social media analytics company Canvs, Thursday night's installment of the
Tonight Show attracted around 2,323 percent more Twitter hate than usual.
While some have argued that Fallon is not a journalist, thus absolving him of responsibility, for many underrepresented minorities in the US, Trump is a figure of fear who threatens their livelihoods.
Fallon has yet to respond to the social media storm he unleashed, however on Monday is due to host Democtratic presidential candidate
Hillary Clinton.