Your explanation should be common sense for anyone who has been around long enough and I agree that it seems to be fashionable to claim that ads have a nefarious, hypnotic effect on The Masses. The thing that does seem to have an outsized effect on how people think is their desire to be seen as part of a group and they tend to signal this by repeating arguments they've heard members of that group make. That's where advertising/propaganda has a real foothold in everyone's psychology. If you form a parasocial bond with an influencer or a group it does have a strong effect on your behaviour since you want to be liked by them so you will say and do things you think they'll approve of and agree with what they say and do. No one is really exempt from this since being exempt involves complete isolation and/or extreme disagreeableness. The only real remedy is having strong bonds with other people who aren't hopelessly beholden to outside influences. No small task since it only takes one member of the group to act as a channel.