I've discovered that the trick is to say you don't like something in a nice way, but forcefully, and not to just say, 'it was nice' to everything to avoid friction, and then get fed animal feed forever.
I'm a tad more blunt than that, after I suffered food poisoning a few years back. Not quite as blunt as my late friend who used to live down the road; he'd throw crap food at the wall to see it would stick.