I don't hate the concept of advertising. It can be done in such a way that it's actually helpful and even welcome.

But that's not how the vast majority of advertising is done. Most advertising is manipulative, deceitful, obnoxious, difficult to avoid, and ubiquitous. It's often injected into inappropriate and unwelcome places. Modern advertising also involves a great deal of spying, which is (in my view) entirely unethical and unacceptable. That spying is what makes me consider ad companies as actively harmful blights on society.

I hate that sort of advertising. It just happens to be the most common sort of advertising.