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.
My only game as a player I just vibed as an evil warlock who sneaks into the guards Barracks at night and casually murders them while theyre sleeping in their bunks then played around to undermine the feudal aristocracy as an appointed investigator who galvanted around exposing crimes of the kings vassals (or mostly making them up lmao) to cause the lands to fall into civil war.
This was more than a decade ago
this is praxis
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I wish my campaigns were this fun