"everytime that pixel is downloaded the sending server knows what IP address it is sent to. Then they can compare that address to other collected data to know who you are and what you are then looking at"
Blah blah blah. This part of the scare propaganda put out by VPN companies and others. It's just not true.
Firstly, your ISP would have to be compelled (by search warrant) to disclose "who you are" from your IP address. I know on TV they can just get your IP address and in the next shot SWAT is bashing down your front door but it really, really doesn't work like that. They would have to show just cause why they need access to your physical address from IP address, e.g. you are hacking into a military database. Loading ads from a retailer's web site? Maybe not.
Secondly, who cares "what you are looking at"? A lot of people make a lot of fuss over this but seriously, what are the consequences of website owners knowing you are browsing cooking pots? You get more ads targeting you with more choices of cooking pots? Oh, horrors.