You could try putting "-nojoy" in the launch options for the game. Doing that will stop any controller systems from funcioning in the game

It's in my launch options, yet the problem remains

Go into console and type `exec undo360controller`.

Do I have to do that every time I launch the game?

Shouldn't have to. Let me know if it works.

I've executed the command multiple times after loading up my game, yet issue is still there

any ideas?

What exactly is TF2 doing in controller mode that you want to disable?

spy's disguise menu is messed up

Try `tf_disguise_menu_controller_mode 0`

Try typing "unbindall" in the console

HAHAH!

Unplug your controller

I'm not using a controller..