Well, because I've seen it before in other "support" communities online. Lets take that dailystrength site that was brought up. On the relationship forum there, a 29 year old guy posted asking for advice about his relationship with his 19 year old girlfriend who it seemed was chatting up other guys. He mostly just got people hating on him for dating a 19 year old. In one reply, this lady literally said "I mean...she's a young girl, of course she's gonna talk to other guys..." basically implying that a guy who dates a younger girl has no business expecting her to be faithful, and then of course she went on to make a comment labeling him as immature or having issues or something like that. Then I remember another guy who was 29 made a post about how he was depressed about not having "played the field" enough and expressing how he wishes he was younger so he could date hot younger girls. Pretty much all the replies to his post were angry women shaming him for being "shallow and immature".