what are some fruit and veggie skins that they can't eat?

Glider's just don't eat skins. I'm not aware of any skins that are dangerous for them.

they shouldn't eat or be offered dragon fruit skin, rambutan skin or seed, lyche skin or seed. They don't typically eat the skin but these ones have the potential to make gliders ill dragon fruit skin can make humans ill as well.

they shouldn't eat raw sweet potato, safe after cooking

rare but toxic, fresh raw lima beans, frozen are fine they are safe after cooking.

Thanks homegirl Leela