I don't know what to tell you. Personally it doesn't feel unethical to me. There are zero negative outcomes for me because of it. I understand the rules of the game and I consent to playing it by visiting websites. Instead of random ads I get more targeted ads, why would I lose any sleep over that?

PBA cards are also considered "unethical" to some, but you still gotta get in the car and drive to work. My advice if you are really concerned with your privacy is to not use websites that have pixels installed. You can also use VPNs and other means to further prevent companies from following your consumer habits. For 99.9999% of people, this is a non-issue, and they are confused when people tell them "Facebook is stealing your data" because it's not really as nefarious as everyone makes it seem.