The Internet started feeling Kylo to the point of making fan art of his shirtless, muscular figure in 2017. Kylo's bad boy nature and conflicted villainousness has clearly made many hearts flutter over the course of the new trilogy.
Skeptics have argued that Kylo is not a good guy and don't see how anyone could think he's hot. Plus, the shirtless scene in "The Last Jedi" is just so random; much of the Internet has poked fun at it with countless memes. Many other detractors just do not feel him like that. Just let Kylo be the conflicted bad guy, not the conflicted bad hottie with whom we sympathize.