If the DM does not like Dragonborn... just kill them off right away.
I agree with you.
The DM serves the role of refereeing the game, they do not own it and should not dictate.
I do not like inflexible DMs who are control freaks.
Now that is a group I'd leave immediately. Punish a player for coming up with a character concept I didn't care for? I stopped doing that when I was 12 . . . no, wait, I didn't even do that way back then.
I agree with you.
The DM serves the role of refereeing the game, they do not own it and should not dictate.
I do not like inflexible DMs who are control freaks.