I can eat avocado. I think it has something to with the skin of some fruit but I don't know for sure. I can eat fruits you peel like citrus and bananas. I can also eat melons like honeydew and watermelon. I can eat grapes, anf blueberries with no problems. Strawberries, Blackberries and raspberries give me only the slightest hint of irritation, not enough to keep me from eating them.
I find that if I peel certain types of pears and rinse them well, it's not as bad. I'll do that on the odd occasion but sometimes it doesnt help at all. Apples and peaches give me the most issues so I just avoid them because there's nothing I can do.
For the record, I am the quintessential nerd that's allergic to everything. This includes shellfish which made living in southern Louisiana tough. I'm also allergic to several different types of trees which makes living in Atlanta hard. For the kicker, Im also allergic to dogs. Why couldn't it have been cats?