Wow. It's only a matter of time before someone gets compared to a Nazi.
Happy to clear the air, somewhat.
1. IF you want to win, you should only ever accept a trade when it increases your chances of beating the person offering the trade. Helping other people build and buy cards usually helps them win, not you. Sometimes people propose a trade when they are on 8 or 9 points - seriously?
2. For that same reason, trading often only makes sense in the early game when resources are scarce. Once you've got a steady supply of stuff, trading becomes way less important. I will only consider a trade when it's offering me generous terms and I can use the received resources IMMEDIATELY. Otherwise, I'm helping someone to progress without a clear benefit in return. Ever traded with someone, then they take back their stuff with Resource Monopoly?
2b. When I propose a trade, I try to save time by offering exactly what someone needs and/or giving them more than I'm taking. If no one needs what I can offer, or I'm well in the lead, I don't even bother trying.
2c. When playing around a table, people can see if I'm actually considering a trade - I'll show interest, propose a counter offer. Other times, it's obvious I'm not interested and there's no point even talking. I might just say "hey, i don't want to trade with anyone right now" or simply show zero interest in trading with body language or facial expressions. It's not rude, it's not against the rules, it's not against the spirit, it doesn't stop the game being enjoyable for everyone.
3. Some people don't pay any attention to what has been rolled. They sit there constantly asking for resources no one has. I have zero patience for this sort of laziness.
4. Waiting for someone to offer seven different variations of the same trade on every turn is excruciating. Again, I'm much more likely to block trades until they get the hint.
5. PLEASE don't tell me how to play Catan.
The last point is a biggie. I don't mind some friendly banter or a reminder that someone has 2 for 1 trades on wood, but 'coaching' is never welcome. Play your own game your own way, please, and let me do the same.
”Why did you rob me? I'm on 3 pts, he's on 4 pts!"
Maybe you have a specific resource I'm after? Maybe I want to block production of a specific resource? Maybe your board position is superior? Maybe you're about to get longest road or largest army? Maybe it's just how I'm feeling right now?
You don't like how someone plays? Hit the red button and move on. No one has a responsibility to play in a way that makes you feel happy.