2. Judging him in a roundabout way for wasting money: “You spend a lot on that stuff, don’t you?”
“I don’t want to be told that by someone who says that spending money on their nails and at salons is ‘self investment.’” Any guy would get angry at being told they are “wasting” money on an interest that might be one of their favorite things to do. Try and adapt his viewpoint to yourself—“If it were me, it might be my money for traveling.”—and this should make it easier to understand.