My strongly held suspicion is that it's a form of the dunning-kruger effect. People have a lot of experience using software-A so much so that they tend to overlook just how much skill and knowledge they have accumulated with that specific software. Then when they try software-B they misconstrue their lack of knowledge with that specific software as complexity.
You just answered yourself. They're just tools.
I'm a professional graphic designer and I will never EVER support any initiative trying to get privative support into Linux and this kind of shitty mindset from colleagues actually irks me. I will support any initiative trying to improve what we already have. You don't even need to be a developer nor donate money to help - bug reports and translations are also a thing. That's how we got to get high quality software like Krita, Inkscape or Blender.
It boggles my mind people can bear a device that can end lifes in an instant and feel like they are fun. I guess this is making my unpopular opinion.
Do yourself a favor and hear that cover bit they did for Metallica's "Sad but true". They're pretty good musicians actually but they just choose to do more corny/commercial stuff – which imho is not valid reason for the hate. Sad but true.
Everyone seems to poke on the vim vs emacs/gnome vs kde/systemd vs everyone else but it seems to me the most toxic feud in the foss world has been x11 vs wayland. People had throwed shit at it because of their own specific issues and its "slow" development pace without realizing it's a titanic endeavour and the hate and toxicity brings absolutely nothing positive to the table nor the development of Linux & FOSS in general.