Most comfortable in social settings with limitless amounts of alcohol (hence the common association to fraternities), and an impressive coherency despite the amount of alcohol consumed. This, in combination with said confidence, has lead bros to exploit glaring insecurities in women, often by putting down and manipulating said women, which is more proof of female stupidity than any given bros demeanor.
A bro's wardrobe is perhaps the most interesting aspect of the creature, as it the most versatile of any other genre of person. There is a notable balance between every category of clothing, save emos, guidos and said "fags”. For example a flat brim(ghetto), throwback John Stockton jersey, nice shorts (preppy), and turf shoes(lax), is a staple broutfit. Not all bros necessarily have this outfit, aspects of even skater, surfer, or even casual luxury apparel withstanding, but girls will stare regardless.
Tom: Just screwing around, how was it?
Joe: It sucked because there were a million bros there.