Really? I'm a Theist and I don't feel attacked. Maybe it just you and not having thick skin.
I do think it's easy to just say that there attacks because you just don't like what's being said, but you can hear there tone of voice so you have no idea how it's coming off like. So in turn you make it out to be attack just because you don't like what they are talking about.
At lest this is how I see it.
I agree with you. It is not always attack, and actually i've talked about God and everything about him with a lot of Atheists and others who don't believe in God, and they made valid arguments without showing any disrespect.
Sometimes however that is not the case. I don't think the OP is generalizing, i'm not sure. It is obvious though that it happens a lot that the sarcasm and offense against one's belief are a bit too much. Especially like it have been pointed out already, when the claims being made are not backed up with evidence. Which is the same thing Atheists criticize about theists.
What i'm trying to say is, that i hope you'll at least agree that what he is talking about, while not being the case always, or most of the time, it still happens sometimes, and i can't see what's wrong with him pointing that out.