Cantaloupe. It's not even close.
It's a bland, yet sickly thing to eat, and not many people actually like it, but for some reason, it's served at functions for some insidious reason. This thread is proof that it's not popular with anyone, but don't take my word for it.
Get one of those fruit platters. You know the one. It has chunks of strawberries, pineapple, cantaloupe, and either honeydew or watermelon, with some red grapes or blueberries on there for color. Set it out at one of your gatherings.
The cantaloupe is ALWAYS the last thing there. It just... ugh.