I don't think people should be made fun of for liking Twlight, and I didn't even back in the day (well, maybe a little at the most extreme Twilight fans), and I understand that the property, like Fifty Shades of Grey, is more equivalent to bodice-ripping Harlequin romance novels than, I don't know, Little Women. However, I think movies have to be open to criticism. I would say that saying people can't bash a movie because it's not for them is along the same lines as saying a movie can't send the wrong message even when it's not sending a message, in terms of sanitizing society. As far as I'm concerned, if there's women (or men) out there who want to bash Die Hard or Under Siege or whatever, they certainly can.
Some guys are going to be d****s about it, and maybe guys are d***s about it more than women are when guys criticize romantic comedies or tearjerker dramas, and maybe that pushes women into silence and misrepresents popularity, but it doesn't change that I dislike Twilight. Breaking Dawn Part 1 is one of the worst movies I've ever seen, and I'm not attacking women by that any more than I'm attacking men when I say Transformers: Revenge of the Fallen is one of the worst movies I've ever seen. They're just terrible movies to me.