Sword of Spirit
Legend
Well then this DM is house ruling how to roll for stats. vis a vis:PHB pg 13 Determining Ability Scores,
'You generate your character's six ability scores randomly. Roll four 6-sided dice and record the total of the highest three dice on a piece o f scratch paper. Do this five more times, so that you have six numbers. If you want to save time or don’t like the idea of randomly determining ability scores, you can use the following scores instead: 15, 14, 13, 12, 10, 8.
The above is the given method as per RAW, i.e., canon, Point Buy is an optional variant which the DM may also allow. in either case a DM who opts for the Point Buy system , should still allow players to roll or use the suggested array instead.
It's unfortunate that any DM would micromanage this point, or that other players would interfere with how a person is to roll up.
I completely disagree. This is one of the core things that the AL mandates be used exclusively, and there are good reasons for it. Random stat generation sets a completely different tone for the characters, and potentially the game. Maybe that's what you are going for, but maybe it's not what the rest of the group wants. Maybe you haven't decided and you'll just let people choose what they do and then go from there.
As a personal anecdote, when I ran Lost Mine of Phandelver, I allowed each player to roll stats and then decide to either keep them or use point buy. That guaranteed no one got shafted, but allowed for those interesting variations you can get from random rolls. Unfortunately for me as the poor DM, the players rolled really well, and I had 6 players in the group. This made the adventure too easy. Not wanting to jump through hoops to make your campaign more difficult is pretty good reason in my book to require point buy (and limit the number of players).