There's a big difference between talking loudly, getting laughs, and winning an argument, of course, Joe came out as the winner as far as people who can't see further than next weekend are concerned.
The reality is, and I am sorry if I can't watch the video again but I remember it back in the day, Joe's whole thing was that boxing was done, that MMA would take over, and that there wouldn't be any more boxing superstars past that point, Joe Rogan also said at one point (not in this interview) that Tim Sylvia was a better HW champ than Fedor.
Needless to say, after this video we've had how many boxing superstars? Canelo, Crawford, Inoue, Bivol, Beterbiev, Fury, Joshua, Garcia, Tank, and I could go on and on, each one of those guys makes in one fight than an entire UFC card of fighters makes for one show and it worse, the two biggest profile fights from two of MMA's biggest stars, Conor and Nganou, were against boxers in the boxing ring and they both lost.
Can you make it worse? Yes, Joe has changed his tune horribly after that video, he praises boxers the whole time, and he has always been a Canelo fan, Canelo being one of those stars that would never happen according to this video.
How can Joe win an argument when most of what it was based on was wrong? Because he talks louder, and faster and makes fun of his opponent better, sort of why people think Trump wins debates.
The UFC has grown as a brand tremendously, but as a brand, much like pro wrestling, the actual sport of MMA is still in the sewers, you remove the UFC and you get shit like Bellator vs PFL, Phil Baroni with his prison suit vs the corpse of Marco Ruas or some shit like that, it's degrading. Boxing doesn't die because it is a global sport, even if showtime dies and hbo dies, the sport has enough of a global following organicaly, someone will always be there to put money in to it because there will always be money to be made.
It's also ironic this video was posted now when boxing is having one of it's strongest years, crawford, loma, ryan, haney, bivol, beterbiev, canelo. All of those guys either they recently fought or they will fight before summer gets going.