Communism is not perfectly acceptable to ME. If other people wish to freely associate and live a communal life, without forcing me to participate, either personally or monetarily, then that is their choice and it does not affect me. But, of course, Communism in practice is the antithesis of free association, isn't it?
Now, on to Nazism. How does your logic exercise hold up in this instance?
If someone wants to not associate with people of other ethnic backgrounds that is his or her business. If they want to marry only with in a very small gene pool I will not force them to do otherwise.
How would their doing that effect you?