I don't think players flex muscles, jaw at others, or do the stare down now anymore than they did 40 years ago. Some people are inherently more demonstrative in reaction than others...always have been, always will be. If you think times are different now than what they were 40 or even 20 years ago regarding this, why do you think this is? It may seem that way because of more TV coverage...more players being seen doing these on-court demonstration, but I don't think the percentage of those doing so has changed much, if any. Some people are hotheads and some need to showoff whether it's in bent chicken wing muscle flex or the rarer bug-eyed zombie-like stare down as if possessed. All the while, some people are quieter in demeanor, more reserved in action. Whatever a person is, if this person happens to be a college ball player, others are there to witness it. We all remember hotheads from our youthful playground days, the arrogant ones ready to pick a fight.