Also, if you think you can counter a "that's not possible" with a working proof of said thing working, think again, most people don't like to be shown they're wrong, particularly tenured professors. That's one of the fastest ways to sabotage your own developing career.
"Yes men" climb the ladder much easier, but then work doesn't do itself so that's the catch. Cue exploitation of interns and other newcomers and you almost have the whole picture on how things get actually done. Hence why "science advances one funeral at a time". Once someone reaches its own Peter level [1], it stops being a productive force and becomes a plug that jams everything behind it.