What is vibe coding and why does it get so much hate?

Proponents of vibe coding argue LLMs democratize software development, allowing anyone to make their own apps. My neighbor used to work as a veterinary tech. She vibe coded an app to make tracking her senior cat's insulin shots easier. On the other side, critics argue vibe coding is producing vulnerable software. Extensive use can also make a codebase more difficult to maintain, since there's a good chance a vibe coder doesn't know enough about coding to fix an error if an LLM can't address it for them.