A night of partying, with the R, Best Man and Mini Me in tow, K realized that it is harder to be kind than to be smart. Come backs and comical punches are easier to throw, than the warmth of pat-on-the-back of someone on whom the joke has not dawned, after the moment has passed.
(That said, K believes that sarcasm requires high levels of IQ; a quicker and nastier comeback, higher levels of IQ.) R and K have always excelled at being bitchy. And as they say, Bitches are like chillies, they give the edge to an otherwise bland palette.
Harbor line thought -
maybe, just maybe, that is one reason why we know so many brilliant/skilled/able people have no character/manners/goodness at all.