Imagine you have a family member that comes to your house. It´s kind of picky, as he/she -gender really does not have any relevance here - and already had some bad experience him/herself - with life, relationships and his/her own family. He/She doesn´t like your house, doesn´t like you, and even if you may be the other person in the world, he/she will not care a dime about you because the idea is to keep playing the role of the outsider no matter what and when.
The story of Jewish community in German after the war and particularly in the last three decades is complex and complicated, both in terms of human resources and conflicts, halachic challenges, perceptions and membership. For everyone coming from Israel or the USA, the difference is huge, but I suppose a Jew from Germany will feel the same about communities and traditions in the USA or France.
Most of the people who are members of the community in Germany, do want to earn their life, have a place for the holidays, educate their children in the Jewish tradition, celebrate a Bar/Bat Mitzvah and eventually be guaranteed a place in a Jewish cemetery. Not everyone has plenty of time to play the star and conceptualize their identity.
One of the things I always find impressive when I moved to Germany was to hear the stories of Jews coming from the Soviet Union. People who went to prison because they wanted to learn Yiddish, people who were harassed because they were Jews, no matter how high the personal status they reached. People who insisted to remain Jews no matter the challenges of being a Jew. There are not too many former communist countries whose Jews are so proud of their identity.
By attacking those humble people whose stories are worth so many good novels, someone is just following a pathway of those extremists this person is assuming she left to become herself. It´s so convenient to be an outsider in this country, talk about ´fetish´ while being oneself part of the system allowing only those funny individual people to take the floor. Claiming cancelled membership in a community does not promote you to an expert and even the less a judge in all things related to a community whose ´deep knowledge´ was acquired from newspapers or encounters in the bar around the corner.
Playing the role of the outsider for purely personal branding reasons may work for a while, but repeating over and over again, on a highly pitched indignant voice the same empty sentences learned by heart to an audience paying you to play this role is aimed to fail. It does not take too long to figure out the intellectual kitsch.