If fonts were rock bands then Comic Sans would be something like one of those 'X-factor' talent show boy-bands, i.e. popular with the masses yet utterly despised by 'proper musicians' for not making 'real music'.

To fit into the 'I am a designer that cannot use anything other than Photoshop club' you have to mock comic sans in all of its uses and show utter disgust at what is a truly popular font. It is as easy to do as mocking the talent show boy bands. On the 'designer' learning curve it is up there with replacing all text with lorem ipsum.

Despite what people say in general Comic Sans is used quite appropriately, particularly by those that are not designers. If you want people to go to the village fete then a 'designed' flyer is not what you want, something banged out in Word with Comic Sans actually conveys the message pretty well.