It probably refers to something like "people who party hard or take drugs on social occasions are disproportionally rewarded". I have definitely seen some of that.

It is not conscious decision to pick alcoholics or drug takers. It just so happen that if you are not present at the party or keep it sober, they feel less good about you.

stimulants like adderall are popular at startups (FANGG too id guess) so hes probably referring to that.

Let's start a software company that has free coffee and joints everywhere with PlayStations and couches (I would settle for a lanparty room that only has StarCraft and quake 3 installed). Also a free lunch buffet catered by panda express and whatever is this week's favorite cookie company startup. What does our software do? Hey man what's with all the questions.