This is a very softball question, it is not being asked for some legitimate purpose.
It's mainly asked as a platform of sorts that serves by being asked so people can answer in the form of reasons for why we loathe advertisements and commercials in general.
My answer is that we don't like to be marketed to, especially from companies of which we don't have a single ounce of interest of doing business with. "BUY! SUBSCRIBE! BUY! SUBSCRIBE!" is regularly chanted loudly from any company that pours millions down the drain to make 10 second ~ 1 minute ads of dramatic theatrics of a product we can live without.
And a lot of their 'research' or lack thereof, of their product is obviously fabricated to get people to buy. That's the primary goal, is to get people to buy or subscribe by any means necessary.
Makes me wonder a lot of the time, why we aren't attacking marketers and salespeople more often. I swear if we all focused on a week or a month by breaking the kneecaps of any salesperson or marketing agent while tormenting their families through harassment because of all of the years they've harassed us and fucked with us by relentless advertising.
I had a shower thought the other day; what would the world be like if advertising didn't exist?
No billboards or giant signs everywhere blocking our views. Content would be better because it wouldn't be interrupted by commercials. But think of how much money is spent on advertising? Companies would have to invest that into other areas to be successful instead, such as cheaper and/or better quality products, or higher wages for their workers. Companies would have to work really hard to get a good reputation so their products could spread through word of mouth instead of using advertising to invade everyone's space.
I'm sure there's some downsides, but it sounds kind of amazing.