I get kind of annoyed with people who claim to be allergic to certain foods in order to avoid eating something they don't like. There's a huge difference, people, and that difference is a trip to the emergency room.
So if you don't like the way something tastes, you should just say so, because lying about it "to spare someone's feelings" is completely stupid. I think that once you hit adolescence, you can go ahead an eat whatever you like and not eat what you don't like, and people will pretty much respect your choices. Because faking an allergy is totally douchey.
Case study # 1:
I made a totally awesome coconut creme pie for my dinner date last night and he turned up his nose at it...
Date: Hmmmm. Smells like Hawaiian Tropic tanning oil.
Me: It's coconut creme pie! Homemade!
Date: So it's got coconut in it...
Me: It's kind of a key ingredient.
Date: Ah....yeah. Uh, I'm allergic to coconut.
Me: (concerned) No way! Gosh, I'm sorry, I should have asked...okay no worries. So what happens to you?
Date: What do you mean?
Me: Do you swell up and explode?
Me: Do you turn blue and explode?
Date: Not at all.
Me: So what then? Is it lactose intolerance? Your limbs shrivel up and fall off? Do ya get giant lips? Break out in hives?
Date: I get a really bad taste in my mouth.
Me: That's it? Does that require immediate medical attention?
Date: Not really. I just don't like the taste of coconut, I guess.
Me: So you're not actually allergic to coconut.
Date: Well, no. But I really hate coconut.
Me: Why didn't you just say that?
Date: Well, you went through all this trouble, and it's a beautiful presentation...
What I thought: Shut the fuck up and eat your pie, you big fat liar.
What I said: How about some Oreos? Or are you allergic to those, too?