Simple...get chatty friendly with the people in front and behind you. If you need to step out, let them know so there's understanding. Don't abuse the "favor" of stepping out by staying away too long. People are good that way.
If we're not having fun, then why are we doing it?
These are DISCUSSION boards, not mutual admiration boards. Discussion only occurs when we are willing to hear what others are thinking, regardless of whether it is alignment to our own thoughts.