I think it originated in 1971, when OR governor Tom McCall famously said, "Come visit us again and again. This is a state of excitement. But for heaven's sake, don't come here to live." It wasn't meant as a joke, he was speaking in earnest. One of his ongoing themes was opposing growth for growth's sake and he helped pass the strict land-use policies that largely still exist. It has become a joke though, you will see "Welcome to Oregon, now go home" bumperstickers and such. And a quick way to get dirty looks at a party is to announce that you just moved here from California and can't believe how cheap the houses are.

The meme is "<____> sucks, dont' go there." Traditionally spoken by a "local", in reference to stuff they love. It kinda/sorta makes sense in the broader culture of "locals define themselves by excluding others" left-coast parochialism. (I don't think HN is the correct place for it.)

Another example of the meme style is this ski resort "tier" map: https://www.reddit.com/r/skiing/comments/1d96f93/my_tierlist...

Which is actually funny. And the "joke" is that the person who made the tier list is trying to "hide" the resorts they want to ski (Mt Rose., Mammoth, Kirkwood, Sugar Bowl, Alpine) from whoever's reading the blog post. While falsely "praising" the famous places in an effort to divert the crowds there. (The Reddit post is great b/c the author clearly communicates that they're being ridiculous.)

Sort of. Phrasing varies, but at least for Idaho it's very common for people who live in Idaho to go on the internet and tell people how awful Idaho is and how you should absolutely not move there. On a related note, for people who do move to Idaho, one of the things they are advised to do as soon as possible is get new license plates so that they're not constantly advertising the fact that they came from out-of-state. Idaho has received a massive amount of immigration from other states and many people are unhappy about this.