Big trap of internet posting: your worst day's post can become a defining statement. Clearly on the day Andreas posted this, he wasn't at his kindest. Nim's great and readable, the code will survive many such days I think.
...just for the record still, I am older than 50, but changing "master" to "trunk" has been a no-brainer...
Unlike Andreas, I just don't care about it enough to get upset, though. I'm perfectly happy with something seeming silly to me and just moving on with my life.
I suspect that Andreas has legitimate concerns about a foundation limiting his ability to set the technical and community direction. Unfortunately, he just didn't communicate that very well in this case.