If Lemmy and Mastodon continues to get popular, we will eventually get Instance wars.
If the descentralization of social networks continue, we will have to prepare for the eventual rise of the instances wars, where people will start to fight about which instance is better and which one is weird to be in and so on, but that's for the future of us all.
It's so dumb, yet it's so natural that even knowing it's dumb sometimes people end up devolving into tribe wars by complete accident.
And then some do it because it's the easiest way to get people to do what you want to them to do. It's definitely best to try to keep it in the back of your mind as much as possible to avoid falling into the habit.
One of the most enjoyable bits in REAMDE was about how the users of an MMORPG split into two warring factions over whether they preferred the default color palette or a custom version.