In all seriousness I feel like the common answers I saw of Diogenes (because that was like, his entire shtick) or Socrates (because they killed him for being annoying) are probably better answers but saying its Trotsky on a leftist forum is way funnier.
Socrates seems in the running for this
Dude was so annoying he was forced to choose between social or literal suicide and chose to become a martyr for debate bros everywhere.