[shardling]

>which is blatantly racist and makes his complete argument null and void, because the comments he makes in this post are no better than the crap he heard at his job.

Oh hey, it's the rare explicitly stated ad hominem attack.

[jlgreco]

I don't think this is an example of an ad hominem fallacy. Rather it seem to be tu quoue fallacy (attempting to discredit by asserting hypocrisy. http://en.wikipedia.org/wiki/Tu_quoque) Technically I suppose that is a form of an ad hominem fallacy, but describing it as that seems off to me.

(Not that that's any better.)

[shardling]

Even the wikipedia article mentions that this is a type of ad hominem. But thanks for teaching me an even more specific term! :)