I don't see a problem here. He's running a business and has determined that sizes 0-12 will give him the most profit. Higher sizes would require redesigning the pants to fit a different shape, changes in production, more material, etc. He simply stated his line doesn't work for women larger than that. He's not being mean, its just how it is. Anyone is free to sell plus-sized yoga pants. If you see profit there, go for it, or just buy from one of the many other companies selling them.