[ionised]

Some clearly doesn't work as intended though.

If I see an advert for Coca Cola, it doesn't make me want a Coke. I hate Coke and I understand that it is not at all good for me.

No amount of advertising is going to make me buy one. Simply being aware of the brand in this case seems pointless, because I'm doing nothing with it.

In other cases advertisements will merely lead me to avoid that brand or company out of spite, because I hated their advert (as I do most adverts).

[manigandham]

That's not the intention. They know it won't work on every single person, but as long as there is ROI then it works.

[DanBC]

It's a shame you got downvoted because you're making a reasonable point.

I loathe Pepsi Max ads. I like Coke Zero add. But I never buy Coke, I only ever buy Pepsi Max.