If your ass is not making it to the session on time at 2 pm like we agreed on multiple times in a row, I will not trust you to be on time for an event.
If you are making absurd demands of the DM and try to bully them to include your overpowered item (including homebrewing it for you and then you throw a fit when you don't like the results), I will not trust you with real power. etc etc
EDIT: I am not looking for DMing advice here, I already do sessions 0, read articles and have dmed and played a lot. I am mostly noting how small shit can tell you if you can rely on/trust somebody for more serious stuff and that TTGs have a lot of small shit coming together at once.
The best evil I can manage is muystache twirling radio drama villains. I re-wrote Cheliax from the pathfinder setting from scratch because it was a stupid-evil nation of badness where everyone worshipped demons even though they'd go right to hell when they died. I made it extremely bureaucratic evil kafka hell, and the high ranking demon worshippers expected they'd be incarnated as immortal demons when they died if they could attract attention from the right functionaries in hell so they at least had some kind of incentive for kicking puppies.
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hell is just a massive DMV