It's astonishing to me that advertising and marketing is accepted as normal. The majority of B2C marketing is designed to manipulate people's emotions so that they act against their interests, in order to make you money. It's really disgusting.
And in doing so you can see that what you're saying is actually not true. Look up any random advertiser and you'll see that it's pretty uncommon for ads to be based around insecurity. Almost always it's on banal product features. The insecurity-focused ads do exist but they tend to be focused on a few broad lowest hanging fruit ad categories.
Also, GP was talking about enterprise (B2C) and ads for B2C are pretty scarce in consumer-focused spaces. Insecurity, FOMO, etc is absolutely used to advertise to people in middle management on up.
(anyway many of the coca cola ads you linked have some theme of togetherness and community, which can be said to prey on people's insecurities around being lonely. Drink this sugar+caffeine solution and you'll be less lonely. Yes you start to sound like a paranoid schizophrenic when analyzing ads like that but that is how it works.)