They're telling him he's too fat, short, and they don't like his style.
The style can change, he can lose weight, but he's not going to get taller. The women on these types of shows aren't looking for long term relationships. He has the energy of someone who is, and someone who would commit to a marriage. That level of stability and maturity right off the bat triggers insecurity in someone who's spent a majority of their life being stubborn, willfully ignorant, and making stupid decisions because of those two character traits.
Without looking I can almost guarantee the comments are full of women calling the birds that turned him down immature or stupid and saying they want him. His profile has been raised and they probably hollering at him in the DMs right now.