Atheists use the term “hypocrite” exactly as liberals use the term “racist.”
Any association they can imagine between their opponent’s behavior and “magic word,” no matter how contrived, is an instant “checkmate” as far as they are concerned. At that point, they no longer have to pay any attention to what the opposition asserts.
At bottom, it is the tool they use to give themselves permission to reject opposing viewpoints without giving the benefit of a fair hearing.