FI has always (jokingly, I think) told me I suffer from OCS: Only Child Syndrome. I have an older sister but she's 8 years older than me so we never really had to share much. That being said, when FI and I first got together I was not a sharer. I wanted my own space, don't touch the food on my plate, and no you can't mess with my things. I'm still largely independent, but I've gotten better about sharing and we've happily lived together for 2 years now and I haven't tried to kill him yet or drew any lines down the furniture designating 'my side'.
However, FI recently pointed out to me that I have been incredibly bossy and controlling about the wedding-planning and that this might as well be "MY wedding" because I'm only agreeing to the things I want to do. Of course my initial reaction was "That's CRAZY!! I'm open to ANY of your suggestions but you never have any!!!"
Boy did he have the ammo to shoot that comment down. He listed several things he suggested that I was not okay with such as the food we had at the reception, the types of dish we served the food on, alcohol stuff, and inviting certain people. I realized he was right, I had shot down a lot of his ideas because I didn't like them. I further realized that I have been treating this like MY wedding and that we can only do the things I approve of, and that's not fair. So I'm making more of an effort to breathe when he suggests something I find tacky, and now we discuss it and come to an agreement. I've won some things (like we absolutely will not have our guests move their chairs from the ceremony site to the reception area, we're hiring someone for that) and he's won some things (fine, we can invite all of your rowdy biker friends as long as they behave themselves and there are no keg stands/flashing of body parts during the reception).
We've learned a lot about each other during this whole wedding planning process. They weren't kidding when they said being engaged and married was completely different than just living together. Thankfully he still loves me and WANTS to marry me. My message to you is hear your guy out. Maybe his idea is awful and tacky, but he probably doesn't spend all day on TK like you or I do to read about what shouldn't happen at a wedding. Cut him some slack and talk it out, and sometimes you just have to bite the bullet and agree to let him have the moonshine fountain he desperately wants...