After thinking it over, I don’t think you you saying

Nothing to argue? More likely you’re too lazy or stupid to formulate a coherent argument.

is an ad-hominem. Nor is Haseo saying

There’s nothing to really argue. You’re throwing out baseless claims because you’re overly sensitive about your religion.

An ad-hominem, in my mind, is saying someone’s wrong because unrelated insult. If Haseo had said

There’s nothing to really argue. You’re wrong, and god isn’t real, because you’re fat and stupid.

That would be an ad-hominem.

What Haseo said is just an observation, whether it’s true or false.

Insults aren’t ad-hominem.