Swarmkeeper
Hero
No. And I'm really not sure where you draw the connection. The friend isn't TELLING me, "We're going to lunch, and you won't take my money." Your description literally was the person telling the group, "We will be doing this thing," which...as I said is logically equivalent to telling people that they aren't allowed to do anything else. That's literally what it means to tell people that they're going to do one specific thing. It necessarily means you're not letting them do anything else. Like that's literally the logical converse. "For all X, if X is a player character, X is a Y" is 100% logically equivalent to "There does not exist any X, where if X is a player character, X is not a Y." By definition they are equivalent.
If I may, you seem to be attributing malintent where there need not be any. A DM proposes a campaign idea - the party is a group of halfling adventurers in [adventuring world]. The players can chime in with "Sounds great" or "Tell me more" or "Hmm... can't we try XYZ instead?" Session zero can hash out this and a whole lot more detail with everyone getting some input. Maybe this particular campaign ends up sounding great to 4 out of the 5 players so that fifth player has a choice: go with the flow or sit it out and wait for the next campaign. No harm, no foul. If only 1 player thinks it is a great campaign premise, well, back the drawing board to find something most of the group can agree on. It's not a situation where the Big Bad DM is imposing her will on everyone. It's a conversation where the DM has a campaign idea, is going to do a lot of work to make it happen, and is seeking buy-in from the players.