I get smarter around smarter people, and dumber around dumber ones. In an intelligent environment, my intelligence also increases, and the lack of such an environment drags me down. When I read too much bad prose, my prose gets worse. Good stylistic models challenge me to improve.
I have an internalized standard of quality, which I developed in Graduate School. It came down a bit when I realized my field didn't really have the same standard. This allowed me to ease up a bit, in a way that I was not happy about, but I never really lost my standard. I know exactly where it is.