San Diego used to be a lot worse in a lot of ways. Honestly people have short memories. Admittedly, downtown is starting to look like 80s-90s downtown again, in a lot of ways though.
I can honestly say that there are a lot of terrible people out there, but in my experience San Diego always manages to come together when it matters. And honestly, in most day to day interactions, the vast majority of people I interact with are pretty nice overall.