Some of you guys can try to rationalize it all you want. The truth is, the negative comments, especially those in game threads, are read by the players. At some point, all of the negative talk DOES have an affect on the players.
Think of it this way, some of you have jobs, maybe.
Would you like to keep getting negative messages from a bunch of outsiders that you do not know, or can see? Or more important, getting negative messages from people that do not know you? Would you like to read they want you gone from your job because of how bad you are at some part of your job?
Only post comments you would say to the player in person. Constructive criticism can be useful, if done correctly. But it can also be harmful if done improperly. Much that is posted here is destructive criticism.
When making constructive criticism, a successful technique to use is the sandwich technique. Place a negative between two positives. Example, I like how player X makes a high % of 3 pt shoots. But his assist to TO ratio needs work, he needs to work on making better passes. Sure glad we have his better than average free throw shooting on our team.
Negative venting on the internet is for babies.