Honestly, there is one player who I would love to give a toxic medal to.
He spent the whole game childishly taunting and name calling all of the other players along with accusing anyone who got ahead of cheating and abusing exploits. Really made the entire game miserable for everybody. I'd love to give him a toxic medal as a warning to other players that this is someone who will guarantee you won't have fun playing. Unfortunately, I imagine that he would respond to anyone who gives him a toxic medal by giving them one back.
So, I'll just be content with my player notes that say "never, ever, join a game with this $@%#* again"