A real fruitarian diet is a sub-set of vegan. They only eat fruit. They believe that fruit is the only part of the plant it willingly gives to us to eat, which makes it therefore the most ethical diet of all. Fruit is any fruiting plant thing so it can be some things we consider vegetables. Sounds like if the banana guy is eating non-fruit things then it's just a vegan diet heavy on the fruit, not a true fruitarian diet.