Actually, I think I'm doing him a disservice here because his point, made very succinctly, is more complex and important than my comments show. When he says "there's a whole bunch of people in this world that we can look at and say they need to shut up and they certainly don't," I think he's referring to the fact that whenever a minority is agitating for an end to unjust privileges and the expansion of equality, those in charge who benefit from the privileges almost invariably respond by telling the minority to shut up, to stop rocking the boat, to not be so disrespectful or obnoxious, that they will achieve more by being more moderate and peaceful, etc.
Many whites told this to blacks agitating for civil rights in America, for example, and while the situation for atheists today isn't as awful as it was for blacks in the 1960s, it's not a coincidence that Christians are saying similar things to atheists that they once said to blacks. The reason why is because these responses are all excuses for maintaining the unjust privileges in the face of strong moral and legal arguments against them. These responses are all about attacking our "tone" and "attitude" because this allows those defending the status quo to avoid addressing our substantive arguments with equally substantive responses.