PepolePeople are very careful (and rightfully so) to say when they don't understand the words of the Achronim or Rishonim to not say they are/were "wrong". But rather to say "I don't understand what he means". Perhaps as well to be careful not to say "it doesn't make sense". I've seen at times the Achronim and Rishonim were also careful to write this way. However do we ever find that perhaps they wrote a later more "sharply" and did say "this doesn't make sense" or that "he is/was wrong"? At any point in history.
Updated: I would ask as well assuming that it is at least somewhat "acceptable" to say such things, until what point in history could a person now a days (a Rov, Gadol, etc.) make such a statement without being thrown out the window?