To be fair to EzekielRaiden, I would not be surprised if at least three or four of the people in this conversation, if presenting "we will all be playing hobbits in the shire" asked to play something like a dragonborn who was discovered by hobbits in the shire, would be told no. If they said "can we talk about it" those same three to four people in this discussion might label them a problem player who refuses to abandon their mary sue special snowflake idea and insists on ruining the game for everyone else if they can't have their way.
And I say this because I have seen that exact conversation play out, with those participants, on this forum, multiple times. So, assuming that that would happen again is not exactly unreasonable.
Edit: And I see after responding to you that two people followed up with "I make the pitch, pitch that idea to the people who would accept it" and imply quite strongly that anyone who doesn't like the pitch wouldn't get a follow up on changing the pitch to something they would like. Which is basically exactly what they said would happen.
If I pitch a campaign I include limitations and restrictions. No evil PCs for example. If someone only wants to play an evil PC and doesn't want to be part of my game, I'm not going to feel bad about it. For that matter when someone pitched a campaign with evil PCs I chose not to join, it's just not what I want out of a game.
If I pitched a dwarven campaign and someone refuses to play a dwarf I'd likely allow it, but they will have to accept that the focus of the campaign is going to be on dwarven concerns because that's what the rest of the group signed up for.