Accumulation of lists on here

Show this list to new players to understand what will draw them hate.

Too many board wipes.

Mass land destruction.

Too much chaos.

Too much targeted discard.

Infinite combos.

Don't concede. But if you must, only at sorcery speed.

Not honoring your politics, you will lose trust in future.

Some would tell you not to let stuff from a previous game affect your decisions in the current game, but know full well that's not a reasonable suggestion.

Try and keep playgroups to an even power level.

Any planeswalker will draw hate.

Don't run too many board wipes.

Always attack when you can aka don't be too conservative.

Observe the banlist.