The answer is to invite all your friends round to you and cook them a fabulous IBS-safe meal! I can't wait till my HTB and I get our first house (by Easter I hope) as then I can have dinner parties.
When I was just a vegetarian, I used to get so fed up with people feeding me Cheese Omelettes and boring stuff because they had no imagination. They just need to know that a restrictive diet isn't bad and you can eat wonderful food on it.
Also, if you go round to friends, you could offer to bring a course with you so that at least you'll have somthing nice and safe to eat. Chocolate brownies for pudding anyone?! No-one can say no to them in my house!