I retired from serious chess in the mid-90's but I still like to goof around online.
Simple etiquette rule: behave how you would in an over-the-board game.
- Resign when it's hopeless.
- You don't play giveaway, let your clock run out, or get up and walk away OTB. And don't tell me about the one time when you got a stalemate against 3 queens - unless you're in a tournament, be a grown up and resign.
- Say 'gg'. You make horrible blunders or get crushed badly OTB; you still shake your opponent's hand and say "good game."
- If it's a fast game, give at least one rematch if you can, or explain why you can't/won't.
None of this is complicated; don't be a jerk just because you can hide in the Internet.
If you won't be considerate enough to hit the resign button in a clearly hopeless position, don't expect me to be considerate enough to mate you.
If the position is clearly drawn, I'll generally take a draw offer even if you only have a few seconds on your clock (tournaments and rude opponents excepted).
I apologize in advance about getting upset over lag. I realize it's not your fault and the chess.com algorithm for lag sucks. But I still get upset when, because my opponent has a bad connection, I move instantly and 4 seconds come off my clock.