Yes, a search from 1985 for neon lighting proves your point about 80s wall splatter painting....
Whatever, I know what I saw in the 80s, what people around me did and didn't do. I agree it looks like tacky and cheap, but then again, the 80s were pretty much all about tacky and cheap looking crap. Would I personally splatter paint my walls to get an 80s feel? Probably not, but if I walked into a room that was painted in that fashion, I would know exactly what they were trying for.
And I sure as hell never saw neat, brightly colored sprites on walls in the 80s, unless it was a poster from a Nintendo Power magazine or the packaging from a game that some kid had thumbtacked up there.
Personally, I find the Wal-Mart jokes to be funny, because where I live, they're actually really nice, clean, well-stocked stores. I've been in some really skanky ones, mind you, but, at least in this area, they're actually a decent place to shop.