That's precisely why I said that this is no false dichotomy here. False dichotomy is something completely different. False dichotomies are things like "if you're not with us, you're against us", or "The new research shows that one part of the theory of evolution is wrong, therefore creationism is right". There's nothing like this here; his was a simple statement of the form "X is not bad, because Y is even worse". See the difference? False dichotomy means (falsely) asserting that when you disprove the factuality of one alternative, only one other alternative remains and therefore it's automatically true. (Whereas apeeal to worse problems is not about factual truths but about the weights of problems to be solved.)