There is one part of the anti-advertising rhetoric which has to do with the fact that we spend so much time online and advertising is very visible there - after all Google, an advertising company, is the largest and most important internet company. That's unfortunate of course. There is another part though that is not just fed up with advertising, but comes from a certain trends towards protecting "my safe space". It…
You are not forced to read pamphlets nor do they insert the content of the pamphlets into your newspapers and letters. Typically the only thing you are forced to do by someone distributing pamphlets is to tell them whether you'd like to take one. If advertisements had to ask whether you wanted to see them, the entire industry would collapse.
Pamphlets are also not magically distributed to everyone. People have to decide to help distribute them, which means other people have to cooperate with you to help you spread your message. It is also easier for others to interfere in your efforts, as, unlike online, people can see who and where the information is coming from, and they can also more easily and directly inhibit distribution. On the other hand, any individual can buy a Facebook ad and, with enough money, shove it in millions of people's faces with little to no oversight. Hence, it is easier to spread misinformation (like anti-vaccine propaganda) through Facebook than in real life.