Not to defend/condemn what Depp may have said, but...
That's the point where celebrty-ness bites the big, greasy burrito.
You HAVE to do interviews, and so many of 'em, that one just blends into another. Sometimes they catch you on a day where you're just plain tired and cranky.
So you're talking away, the guy is asking all kinds of weird questions, and you let down your guard...
BAM! Next day, "So-and-so says____________!! "
And maybe you can't even remember saying it! So you try to get the transcript, but now the interviewer, wary of lawsuits, says you have to talk to such-and-such lawyers. So you throw it over to your publicist, who is
actually delighted at the "ink" you got, and issues some statement which nobody will hear, and people continue to give you dirty looks and drop dinner rolls into your soup at restaurants.
OTOH, I hear the $$$ is pretty good....