a little simplistic, overmydeadbody, surely?
my 4 year old dd2 loves Disney princesses. and has probbly at some point said she would like to live in a castle/marry a prince/grow up to be a princess etc etc.
shoudl I really be sitting he rdwn and telling her that:
castles are big and draughty, you wouldn't believe the Listed Buildings issues, can't afford the ocuncil tax etc
princes are all feckless wasters
being a princess is a life of boredom and being unable to live oyur own life freely
etc etc
or shoudl I let her twirl around for 5 minutes, happily playing at being a princess?!
she (naturally) does a load of other stuff too - all the running about (but she'll never win th eolympics, so maybe I should knock that on the head), being a pirate (surely I should tell her that piracy is no way to make a living!), she was pretending to be a giraffe this morning - she's not tall enough, and doesn't like greens - she'll never survive 
honestly, lighten up a little (generaic, not aimed at anyone in particular)
I can understand the nazi/homophobic/under-represented minorities angle - but again, this is easily enough counter-able - my dds do not watch constant Disney, certainly have a wide range of books, and do no exist in an isolation bubble - I do actually talk to them about stuff!