This isn't the fast weapon switch, but how do I disable this menu?
Solution 1:
From OP:
I figured it out, it was because I have a wired xbox360 controller plugged in. It like takes control of some of the ways the game works. Unplugging the controller took the game back to normal. It also screws up the engineer menu and combines the build and destroy tools, this is how I found out what was wrong. It was telling me left trigger to destroy my sentry.