A non-insult. A totally ineffective insult, often a word or phrase used as an insult that is, in actuality, not at all insulting.
Recently owned player 1: "Wow that guy is keen".
Recently owned player 2: "Yeah he's a real Terry Tryhard"
Player three: "Yes he's trying to win at a competitive game, you guys fail at insulting"
Player four: "nonsults ftl"