You clearly do not understand ad hominem. An example of an ad hominem attack: "You are on the internet, therefore you are wrong." The premise "you are on the internet" is clearly true. That the conclusion has anything to do with the premise is the fallacy.

A similar fallacy would be to say that because prominent global warming skeptic Frederick Seitz's institute received $630,000 from Exxon Mobil, his ideas should be dismissed. That would be a fallacy. His research should be dismissed because it is either un-replicable or based on poor methodology.