It seems to me that complaining about course conditions definitely falls into the category of Conduct Unbecoming a Professional. These are supposed to be the greatest golfers in the world and should be able to handle not-quite-ideal (or even far-from-ideal) conditions.
With players getting on Twitter to complain (http://www.golfchannel.com/news/golftalkcentral/vegas-qualifier-site-receives-scrutiny-from-players/) about courses, should the PGA start issuing warnings? I don't think the complaints are worthy of fines or suspensions but they definitely reflect negatively on the players and tour.
At this point, it would be refreshing for someone to step up and say "The conditions today aren't ideal but you play the course as it is."
Maybe the PGA could just have mandatory "Twitter training" on how not to be an ass in 140 characters.