FYI - Supes was "able to grab the kryptonite" only because the future Batman drops the force field and lets his guard down thinking that this Supes was the Superman from his time (i.e. his friend). In other words, this was not really a feat worth showing here.
Also, why are we now posting "easily slaps or knocks out Batman" as some kind of incredible feat?
EDIT: Smells like spite to me.