To me the Mickey one takes is a Mickey Finn, 1920s slang implying knockout drops placed in someone's drink unperceived,,as in "slip him a Mickey." Elliott Paul once wrote a mystery titled "The Mysterious Mickey Finn" - a very funny mystery too, I might add).

Taking a MIckey, meaning mocking or indicating disrespect, is a wholly different use.

And to call something "Mickey-Mouse" the adjective is disparaging, implying cheap and impromptu and perhaps fragile (and short-lived) construction. I don't know whether it came from Disney's mouse (who was originally "Steamboat Willie," as I recall; the mouse name didn't come until later) or the other way 'round...

[Oh, btw, congratulations on your promotion - you are now officially no longer a Newbie ! ]