You probably would be well advised to read up on the economics of consumer differentiation and price discrimination.
All of today's ad-tech is set up and developed for that purpose. Whether overtly or covertly, it is the singular purpose, because the case is so clear cut: We are distributing the share of the pie between companies and consumers.
It is therefore clear why people aware of basic economics consider agressive tracking and privacy violations hostile, because they ultimately are or will be.
I am not worried about actually showing ads that are personalized in some way. But as others have pointed out, cookies are not for that. You can target based on the site's content and you are probably showing me a much more relevant ad anyway.
I am worried that every offsite ressource and every ad is used to track me across hundreds or thousands of shady services that operate under zero regulation or control, the combination of which allows market actors to determine how much of my consumer surplus they can extract in every sense, and thus actively devaluing the internet for me, in excess of what happens in the real world!
And the responses of the ad industry lobby groups pretty much prove to me what they think about choice and what they expect to get from consumers.
At this stage, it is entirely rational and ethical to consider the entire ad industry as hostile.
As a group, with all side-effects, the notion of just "showing an interesting ad" simply does not exist anymore. At least for the collective industry. Any effort you took to track users, no matter how noble, will ultimately be hostile to me in the future.