This seems to be a common comment. But advertising loves to take advantage of quirks in human psychology. It seems a bit of a stretch to claim to be immune to advertising.

Even if you do carefully research your purchases, you're influenced by which products you're exposed to, which are reviewed, social media chatter, etc. This is all heavily influenced by marketing efforts which are a lot more subtle than banner ads.

well then you must be inhuman because subconscious bias plays a part in online advertising. sure you can mentally block them but eventually you will fatigue from the cognitive overhead.

sorry to paint such a bleak picture but this stuff is ubiquitous, both online and offline, and it will eventually and consistently break your mental defenses in a way that you might not even notice.

Well - you need to realize you are absolutely an outlier. The entire online advertising thrives because ads - as a function of ROI - works. A $ which an advertiser puts in generally [1] nets out to more than a $ that they get back.

[1] I use generally and not specifically since on average the ROI is positive but for some advertisers the ROI is negative too.