Why is it that when a woman rejects a marriage proposal she's the bad one?

most likely because it takes a great deal of courage for a man to ask a woman to marry him and most of them do not do it at all unless they are pretty sure she is going to say yes. for her to say no is a pretty big slap in the face and shows that he has totally misread their relationship. i don't know what you have been watching on youtube, but not very many women say no when the man they have been seriously involved with asks them to marry him.