The only time I’ve encountered people that care a little too much about what distro is being used, is right after having transitioned to Linux; the sheer liberating potential of the thing can make you lose your head.
I’ve come across a lot of professional bias about Linux distros, but that’s usually due to real-world experience with tough or bad projects. Some times, decisions are made that make a given distro the villain or even the hero of the story. In the end, you’ll hear a lot of praise and hate, but context absolutely matters.
There’s also the very natural tendency to seek external validation for your actions/decisions. But some people just can’t self-actualize in a way that’s healthy. Sprinkle a little personal insecurity into the mix and presto: “someone is getting on great with that other Linux I don’t use, so Imma get big mad.”
Put any distro in front of me and provided I don’t need to master it, I’m good. Ubuntu is fine. Debian is fine. RedHat is fine. Fedora is fine. I even have a tiny low-end system that is using Bohdi. Whatever. We’re all using mostly the same kernel anyway.
90% of what I do is in a container anyway so it almost doesn’t matter; half the time that means Alpine, but not really. That includes both consuming products from upstream as well as software development. I also practically live in the terminal, so I couldn’t care less what GUI subsystem is in play, even while I’m using it.