Yes, you have a right to your opinion. It doesn’t make it OK for you to be rude to someone who makes a good faith offer to do something they believe is nice for you. Honestly, I don’t think you’re a rude person! I’m just cautioning you about the mine fields that surround weddings. The bride and groom have to be very careful about expressing their wishes, especially when it comes to the parts of their wedding where someone else honors them with a party, lest they seem self-centered. It is not that they cannot have their own opinion or voice it, but they need to be very careful about how they do it, because others are all primed to take offense, too. It is a very emotional time! These are all people who will be your family or close to your family, the very people you will run into at every wedding and funeral for as long as you live. Sure, you and your husband have to defend your new “sovereign borders,” but diplomacy is in order!
For example, you may say, “That is so kind of you to offer, but you don’t have to do that. Besides, I’ve been out of college for quite a long time. Between John’s collection and mine, we really have all those little shower-gift kind of things we need–if anything, we’re going to have to get rid of some of what we have when we only have one set of kitchen drawers! I’d feel guilty if our family and friends brought us a bunch of gifts, even shower gifts, when they’re already buying wedding gifts, not when we don’t have the need that other couples have when they’re starting out.” Great. There is nothing wrong with turning down a bridal shower in your honor in that way. (Notice that I did express everything as being for both you and your husband-to-be, and not just for you and “your” kitchen!)
You can even accept but say, “I don’t want to sound ungrateful and I don’t want to hurt anyone’s feelings, but can we retire the traditional games? I know some people still like them, but I have resolved that I am never going to make another wedding gown out of toilet paper, and I don’t think I’m alone on that.” This is not the time to expound on the political importance of your stance. You have to put the feelings of the person who wants to honor you with a party ahead of your own. You can, however, express your opinion that these games have probably had their day and need to be retired, provided you are as kind as possible about how you say it and as gracious as possible about the way they handle your request. If you just cannot stand a party that doesn’t meet your specifications, then politely turn down the offer to throw you a party at all. (Whatever you do, do not turn down an offer by a relative of your husband’s but then accept an offer by someone else.)
You may find that it is hardly possible to turn down a bridal party given by your husband’s aunt without greatly upsetting every female on his side of the family. Do him and his mother a huge favor in that case: Sit through the shower with good grace and think of it as throwing your body on top of an etiquette grenade with the pin pulled. It is not such a great penance when the goal is shielding your new family from shrapnel coming from Aunt Sue and Aunt Mabel. (Boredom won’t literally kill you. That’s a myth.)
I hope none of that happens to you, really I do, but you do have to realize that no wedding is about just one person, not even the bride.