Easy misconception, but actually being a mentally ill paranoid schizophrenic you are more susceptible to abuse. In this situation Hax was the one who slung the first mud. Leffan told him that his meta theory was shit and Hax called him a future serial killer, a bitch, insulted his non-existent girlfriend, and demanded he never use his name again.1. / 2. Well he's clearly not well of the mind on this part. This is rationalizing. Trying to find a answer when there is no inherent reason, and his went off the deep end.
3. Actually pretty normal situation. When your mind isn't fully developed (he was a kid lol) you are more susceptible to abuse which includes online mudslinging. Leffen went out of his way to constantly mock and mention Hax.