They didn't USE to be. For some reason, somebody keeps adding years to "Baby Boomer."
Gen Xers have always been defined as being born after 1946. Not directly after, but after. 1965 is after 1946, unless as I said before, I missed something.
So saying he is bashing everyone born after 1946 is sheer hyperbole. IF he is bashing anyone (not sure he is), then it is Boomers, who are usually defined as 1946-1964 inclusive, and the totality of humanity born after 1946.