Even those who loudly proclaim that studying is useless must admit that cultured people often have much higher conversation levels than ordinary folks.
Because when these people speak, they truly beat around the bush. Many comments that sound like praise, compliments, self-deprecation, reflection, or other pleasant things can be full of sarcasm if you think about it differently.
Not to mention that these are doctoral degree-holding mathematics professors and researchers. Once they jump onto Facebook, they are definitely individuals whose words sound very agreeable.