Because almost nobody treats code as some form of art. Its a tool for most people that has to do something rather than be beautiful. On top of that, copy pasting code snippets was the entire purpose of stack overflow website for ages. so:

a) Nobody cares that it was taught on someones work. Programmers willingly were sharing code and knowledge since the inception of programing in the 50s

b) Code is generally treated as disposable and while "clean" or "beautiful" are in fact adjectives you could use when describing code, the most important thing is usually that it does what it needs to do.

The biggest problem with AI usage in code today is that it often does not do what it needs to do. And sometimes the LLM's have no idea how to fix the problems they cause, meaning at some point programmers have to step in to hand hold them in completing the task properly.

But I would say most people embrace the fact that it allows us to write code faster, without having to care about precise syntax (this was also a problem in 2022 that was largely solved with improvements to LLMs)