Do you often meet people during meeting whom will say "That is wrong" or disagreeing and when you ask why? They will just say something along the line "Whatever".
How do you deal with these type of people?
it means you have ZERO influence on their compensation and/or promotion
the moment their compensation and/or promotion depends on your input
WHATEVER you say
these people will say, You Are Right
even when you are 100% wrong
so to deal with such people
be their boss
or
be their boss's boss
otherwise
You Are Wrong
whatever you say
even when you are 100% right