Not the OP but to give you an example. Spines on books in German are written one way along the spine. While generally in English books it's the other way round.

https://www.reddit.com/r/germany/comments/1n5booe/do_all_ger...

Both have their trade-offs and most cultures are chill about it, but a lot of Germans will swear by the way it is done in Germany being the logical method. It is a vrry homogenizing culture that way.

It also goes for most things in life like sentence case vs title case for headings. Pairing of flavors in dishes (although that is changing).

All in all, it gives you the idea of "there's a german way to do things which is the correct way, please adjust."

To be clear, there are some German ways which I think have much more far reaching consequences, and one about should argue about them, like attitude toward labor laws or LGBT stance. (And whichever way you feel about it, you can agree that the stance has far reaching consequences). And Germans will club all of the different level of seriousness together at the same level with whether you have a accent in your German, for example, when considering how integrated you are.

And that is incredibly frustrating and makes one feel left out. And it is not just immigrants. I know people who moved from Hamburg to Erlangen who felt more left out than me who moved from India to Erlangen (mostly because I had a German girlfriend at that point.)