I kind of struggle with this. I basically hate everyone elses code, and by that I mean I hate most people's code. A lot of people write awesome code but most people write what I'd call trash code.
And I do think there's more to it than preference. Like there's actual bugs in the code, it's confusing and because it's confusing there's more bugs. It's solving a simple problem but doing so in an unnecessarily convoluted way. I can solve the same problem in a much simpler way. But because everything is like this I can't just fix it, there's layers and layers of this convolution that can't just be fixed and of course there's no proper decoupling etc so a refactor is kind of all or nothing. If you start it's like pulling on a thread and everything just unravels.
This is going to sound pompous and terrible but honestly some times I feel like I'm too much better than other developers. I have a hard time collaborating because the only thing I really want to do with other people's code is delete it and rewrite it. I can't fix it because it isn't fixable, it's just trash. I wish they would have talked to me before writing it, I could have helped then.
Obviously in order to function in a professional environment i have to suppress this stuff and just let the code be ass but it really irks me. Especially if I need to build on something someone else made - itsalmost always ass, I don't want to build on a crooked foundation. I want to fix the foundation so the rest of the building can be good too. But there's no time and it's exhausting fixing everyone else's messes all the time.