If I were to get married, I would like to have a very simple, casual ceremony and more like "lunch at a restaurant" than what you might call a reception. One reason is I simply can't fathom making decisions on all the details that go with, say, a BWW. There are so many things in the world I simply have no opinion on. From that point of view it would be fine if my partner wanted to make those decisions, and then just run them by me before setting them in stone, on the off chance something bothered me. And I'm female.
Even my friend Amy, who has an opinion on everything, started to get burned out by all the decisions during her wedding planning. She was also surprised when her DF, Adam, had an opinion on certain things, because he's normally the opposite of detail-oriented; but she only got mad about it when he expressed his opinion inconveniently late, or as a second guess of her opinion after initially ceding the decision to her. Which would irritate anyone, I think.
I do remember there were a couple of what I would have called "important" things, where they disagreed, and the idea seemed to be that her opinion trumped his. Which made me a little uncomfortable, to be honest. She wants X, he's not so sure he's really okay with X, and she thinks he just ought to go along with her anyway. And, other people--like Adam's own father--were saying, "The bride wants X, you should do X." I was talking to my dad about it--he's a minister who does a lot of weddings--and he also felt that ultimately, the decision should be the bride's.
My personal feelings aside, my point is that the bride in the OP could very well be hearing variations on "it's your day, not his" from a lot of different sources--not just silly bridal magazines (are there even any groom magazines?) but also from people in the previous generation, maybe even in the groom's only family. Which is not to excuse her, because I do think there's a basic respect that people should have for their partner's opinion on something that affects the partner, too; but she may not be getting much encouragement to think of it that way.