Funny, but I think eating asparagus and watercress with your fingers is rude. I have no problem with eating traditional finger foods with my gingers - crackers, chips, raw veggies in dip, tacos, burritos, sandwiches, veggie burgers, corn on the cob, casadillas, fruit, dried cranberries, nachos, breads, muffins... I guess I eat more with my fingers then I realized.
As long as people wash their hands I have no problem with eating with fingers.