I really wish people would stop saying this. It is a completely idiotic statement. There are hundreds of people throughout history that quite literally gave their lives for privacy, as recent as one generation ago. Complacency and the silent majority does not equate to "no one cares about that" otherwise, you wouldn't have so many privacy centers and advocacy groups throughout the country.
> Most people don't have anything to hide from advertisers.
"'I've Got Nothing to Hide' and Other Misunderstandings Of Privacy" https://scholarship.law.gwu.edu/cgi/viewcontent.cgi?article=... It's a good read, and I hope it convinces you otherwise that privacy is as important as ever, even in lieu of fallacious "nothing to hide" arguments.
From the paper, the easiest way to debunk the "nothing to hide" argument is to ask easy questions.
"I've got nothing to hide." "OK, so why do you have curtains or blinds in your home?" "OK you have nothing to hide, so can I see your past credit card statements?"
If we all have nothing to hide, why don't those interested in our private lives show us theirs? It's the ole "Show me yours and I’ll show you mine" adage.