I am neutral in this case.
I don't find it offensive, although it is silly. I suppose if you don't like it, you could switch the trait for something else. The sims is a game and it is ideal to introduce some 'challenges'.
Although on the other hand, allergies/intolerances do share similarities with disabilities and the consensus on our community is to not include disabilities in the game. I believe disabilities will really change the dynamics of the game. Disabilities are a really complex issue and I believe this would spoil the fun of the game. I could see a lot of fighting arising from this also.
