I'm kind of impressed with his response, actually. So many people in this "industry" get all defensive and pissy if you dare to challenge how they choose to conduct their business.
Maybe this person has had bad issues with Pay Pal in the past. Plenty of people have been completely burned by that means of transaction. It's entirely up to them how they choose to run their own business....and if it's important enough to them to stick to their guns, even if it means losing a sale....then more power to 'em. I certainly wouldn't take it personally.
And it's entirely within your right to choose not to buy that snake if you can't accept their offered methods of payment. But you shouldn't hold that against them any more than they hold your choice not to buy against you.