I guess the only real 'enforcement' i see happening here is a kind of societal cold shoulder, or dismissal. If that's the worst of it, then I'd say it's a bearable form of oppression. As a Ne user, the most I can ask for is that everybody is able to get their say if they so choose to say it, and not be too strong armed around in if and how they choose to express themselves. I don't know if that fits within your oppressive tolerance parameters, or not.
In rl, I get angry and active when things like that start interfering with my mode of living.. my way to feed myself and be myself. Multiculturalism hasn't gotten in my way, but I probably dont run in the right circles for it the affect me.
Honestly, I don't understand any of how human nature and culture works in the big picture.. and I'm puzzled at those who claim they do. I'm incredulous at those who 'know' the absolute right now, I'm dubious about how anybody can predict how our approaches will affect the microcosm when we can barely guess what will happen to us on the street tomorrow, especially since the more I learn, the less I feel I understand. Culture is an ever changing animal, hopefully morphing towards our needs and sometimes taking monstrous forms in the process. And really, multiculturalism is really just a sham, it's just an effective foil to further specific interests, those pushing it will only be tolerant enough. I'm sure this is part of your problem with it, the hypocrisy.