Acting "weird" (well or just weird, depends) is something I have contemplated, too. For now I have to confess that I mostly try to stick to the norms (especially in public) except if I have a good reason to do otherwise. I think I might make this one of my tasks to just do some random "weird" acts of kindness.

About the alienation: I don't think that we should do a lot about that. I think enforcing certain rules and having our own memes and terms for stuff already has some strong effects on that. I certainly felt a bit weird when I first came here. And I already was having thoughts like "don't judge something by it's cover" etc. in my mind (avoiding certain biases).