Player A was trying to convince a guard to give them keys. Player B added that they were willing to give the guard an item that would essentially let them escape a rapidly deteriorating dungeon area.

I called for a check to basically see if this would be enough to persuade the guard to abandon their job to save himself. Neither player had great Charisma but neither had totally dumped it either. I gave a bonus because of the help and because it was a good play to offer the item (this was 2nd edition D&D, so no advantage).

Player C chimes in and says they'll roll because they have the best Charisma. I ask what they are adding to the check and they just say the exact thing the other players already said. They kinda just say they want to roll it because they have the best charisma. So I say that I'm going to keep it as the other player rolling and I don't let Player C roll for it, but that player seems disappointed.

I guess I'm just wondering if this could penalize shyer players who wouldn't necessarily be the first to propose doing something, so they never get to roll for it. I don't always mind players doing metagaming to decide who should roll for something - in fact, one of my other groups does it often with history/arcana/investigation/lore/etc checks, but it represents all of them taking the time to read the book together. Also they are just eager to learn the lore lol and I appreciate that. But for this it felt different and off, and I felt oddly harsh straight up telling the player they couldn't roll for this scenario.