Sister- Right, it is difficult to change the little things, but we can please Jehovah by staying away from those things.
You: Well what about the "little" matter of mispronouncing his name tor all these decades?
Anyway, the words Bless, Blessed and Blessing are often used by the religious and they usually have something to do with God so therefore, JW's are automatically the authorities on the matter. If it wasn't their own idea to say "bless you " to someone who sneezes, then doing so is displeasing to God, unless the Governing Body has new light on this and other equally important matters.