I have sensitive buds as well and usually ask to take out the onions, pickles and sometimes sauces and it's really annoying when they give your order wrong. It's not that I wanna be digging into my food searching to take out stuff that shouldn't be there in the first place, and then it still tastes like it most of the times >.>
Though allergies are way more serious.
I have a friend who's lactose intolerant to milk and sometimes when she asked for soy milk people would completely ignore her and give her normal milk anyway. Then she'd feel unwell for the rest of the day just because someone didn't bother to properly take her order. It has happened severous times, and now she just reminds them about her intolerance right before picking her drink up and there have been times they wouldn't give it to her right away and ask to wait so they could make a new one with the soy milk this time.
I can only imagine how this can be way more dangerous for other people with more serious allergies and symptoms.
