I've seen him on TV several times. He's made a name for himself mostly by being prevented from speaking by a nutty mob.
Who says mobs never do any good? Not Milo. He's definitely a self=created personality but I didn't realize he had such a dark side.
His dark side was never a secret. At that, the rise and acceptance of Milo in this new weird 'right' has been red flag for some of us for a long time. And it isn't because he is gay. He has always been a vile troll. He never had any real belief foundation other than to get as much attention as possible. A while back, he described everything he has been doing as just a 'performance art'. He chose the Right this time because he saw an opening.
Hell, there is a lot worse out there on him from before this latest political cycle. Looking up some of the info on Gamergate last night during a discussion, I found old references (2014) to him being a pretty vile anti-Semite/holocaust denier (probably just another character he was playing to push buttons). Again, these were before this political cycle, not when he was the darling of the right, so this wasn't new.