I think the point is, the specific wording "we don't do that here" is patronizing and othering.ok, i kind of agree with that. i was not responding to that part of the comment.
the idea of "reconsidering the finer points of the rules" is really interesting - it suggests that the comfort of the first 5 matters more than the comfort of everyone else
no, it suggests that when 10 individuals join an existing team, they ought to learn more about the team culture first, before they try to make changes, unless the existing culture is clearly hostile to some people.
consider the difference between 10 new people joining all at once or one at a time, a few weeks apart. why should 10 new people get the right to dominate the culture that i am trying to build in my company? i am paying you, so you follow my culture. once we know each other better, then you may start pointing out problems that you discover. but if you come in and start being disruptive because you disagree with my company culture, then you better go look for another job. even if i am wrong, that's not the way to implement changes.
the critical point is, that such issues are not a question of majority, but one of inclusiveness. we want to reject a culture that excludes some people. so if the original 5 people have a problematic culture, then the newcomers are good to try to change that (but being disruptive is unlikely to work), but if it is the reverse, then it's the newcomers that need to adjust.
EDIT: added some clarifications.