Citing wikipedia: "Gratuitous verbal abuse or "name-calling" itself is not an ad hominem or a logical fallacy.[8][13][14][15][16] In order to become a fallacy, the insult would need to be given as a reason for believing some conclusion. An example would be, "X is idiotically ignorant [of politics], so why should we listen to him now?""

Also, "Is he wrong or uninteresting in this case?" is a false dilemma.