Of course not!
It is not the Captains job (his/hers is clearly defined by regulation) to teach (on a line flight) unless the (mostly younger) 'student' is willing to learn.
This is called transfer of experience, and happens in all walks of life.... Used to be called master & apprentice.
"There are no bad students, only bad teachers"
-Old Chinese saying
"If you do not learn something every day of your life, (especially in the aviation game) you are probably dead."
-Nephew Bob