My first 5e DM brought my personal quest to a culmination on a day where I wasn’t there.

Same guy, I was playing an Arcane Archer while it was still UA. Then the official book came out and he wanted me to switch to the official version, which is perfectly fine and understandable. But in a later campaign when he was a player and someone else was DMing, he was playing a homebrew Gunslinger there was an official version and when the official Gunslinger came out, he tried to convince the DM to let him keep playing his version. On top of that, he kept trying to hide the character rules from the DM.