It is simple.
Buster Douglas was a professional boxer and while not a top heavyweight he has boxed all his life. He had legit wins on his record.
So, while it was shocking and considered one of the biggest upsets of all-time, it is totally different than McGregor who has never boxed before in his life beating one of the greatest fighters of all-time in Floyd Mayweather.
Flip the page to see what Buster said to TMZ…