He's been very paranoid in the past about people quoting his words, because he doesn't want to be caught in a lie. He freely deletes his own posts and those of others he thinks will cause him trouble.
A good way to take him down, when somebody eventually does, will be to go around to all the people who've been slighted by him, gather any chat logs and written records they have, cross reference it all, and publicize it. If Alex hasn't changed from the way he used to be, that will reveal glaring inconsistences, evasions, and outright lies all over the place.