Unless you've put down deposits already, then you're not locked in to anything. Switch things up and then keep details tight-lipped so they can't steal your ideas.

Personally, I wouldn't be bothered by most of it -- it just sounds like petty shit on their end. (And the day certainly isn't about their petty shit.) And that slogan is ridiculous. They sound like they're mentally still in high school. (And that would be lame even for then.)

Besides, when all is said and done, you really don't remember much about the wedding until a few years after the fact. You spend so long planning it and it happens so fast that you really don't have time to process the events of the day until much later. (I had someone tell me that, but I didn't believe them. Turns out that it was true. I didn't start recalling much of anything until a year or two after the fact.)

Personally, if I knew what I knew now back then, I'd have eloped and spent all the money for the wedding on an AMAZING honeymoon. There are so many family politics with weddings that I wouldn't go through the drama again. If I did have a ceremony at all, I'd choose somewhere pretty and quiet with a priest and maybe just a handful of immediate family and super-close friends. (No more than 20 people tops. Including the bride/groom/priest.) Also, I'd probably save money on the big dress and go for something simple and classic that I could wear again on anniversaries or something. (The big fancy dress sits in the closet and just takes up space, but you feel compelled to keep the damn thing for one reason or another. It's stupid.) The only things worth splurging on is the honeymoon and the photography. (Because of the memories. That's all you take away from the event after the fact.) 

TL;DR -- Don't sweat the petty stuff, just do your own thing and ignore them.