Pet Peeve: Just Sayin'

  I can take criticism pretty well, but recently a phrase has started cropping up that really irks me:
  Just Sayin'
  The format of it's use goes like this:
  "You probably should/shouldn't do this/that. Just sayin'
  Adding the 'JS' ending is a total cop-out, presumably meant to not offend, which in actuality, is very offensive.
  Just sayin' what? That you don't mean it? That your statement isn't really worth the words you wasted on it? Just sayin' that your grammar sucks? Just sayin', as in "don't shoot the messenger"?
  If you've got something to say, then just say it. If its a criticism, then give me a basis that it is built on, some angles, examples and (hopefully) a recommendation for improvement.
  This favoured term of the millenials needs to be eradicated.