By holding a OOC vote in a realm, you are basically saying "Here's an addendum to the social contract. When you specifically play in that realm, you must play your character in that fashion. If you don't like it, leave the realm. No IC opposition will be tolerated because we've decided to do this OOC for the good of the realm."
And that's wrong.
That depends.
You can not modify or overrule the Social Contract or parts of it. And you can not exclude people, so saying "you have to be X in order to play in this realm" is wrong. However, setting a tone for a realm, giving it some atmosphere, culture, etc. is great. And in part that almost has to be done OOC because culture is a complicated thing that is very hard to bring across in a limited game environment. Your character would've grown up that way and consider it normal, but the only way to make you feel like that is by telling you OOC.
And in most cases, people going against the realm culture "IC" are not really playing that much IC. Going against your culture is not something you decide upon on a lazy afternoon, it's a major, life-changing event.
Also, if the culture is extensively developed, there is such a thing as respect for the other players' time and effort.
If, however, the thing you need to do or be is something OOC, like being on the forum, or in a specific IRC channel, or of a certain nationality or whatever, now that's certainly something I wouldn't welcome.
