I don't have a problem with them; even if I did, I've seen a number of more objectionable ones here over the years that haven't caused this type of controversy.
Yeah I don't see why his sigs are so bad either. Sure they aren't good arguments and some say objectionable things but so are most signatures. I mean, does yours provide me for a rationale for why I should support Walter Jones? I wouldn't think I ought to expect one. Mine sure doesn't provide any such argument for the statement it contains.
Lastly, it is hard to argue coherently with multiple people at the same time. That is the challenge of being in a room full of people who disagree with you: you still only get the same amount of time to respond as each individual opponent has to argue. He's treaded thus far into hostile waters; I suppose the straw has finally broken the camel's back today on AAD. The environment of a school cafeteria akin to that place is not an easy environment to argue an unpopular opinion. I know I find myself typing up things on both forums and then deleting them simply because I know I won't have time to spend the next two days defending their content.