Why get offended. I run into this all the time. Somebody is allergic to pepper, somebody is vegetarian, seafood allergies etc. And some have teeth or chewing problems.
I invite people because I like them; otherwise why invite them?
I tell people that if they don't like a particular pizza or any other food that I make let me know and I'll make reasonable accommodation the next time.
Also keep in mind when you have a party, that there is going to be waste, whether it's the crust or some other food. Don't sweat it, not everybody is going to like everything you make. Enjoy the cooking, enjoy your friends.