I imagine I’m in the minority. I imagine most people, especially younger people, desire not interacting with others. Some people find it difficult to engage in real life. Some people are fraught with the impact social media addiction has struck upon them - be it the fear of judgement or bigotry or simply not knowing how to interact respectfully with others.
Self checkout is just way quicker. No need to look down and essentially think that there is something wrong with people that prefer the quicker and more convenient option.
Also interactions with cashiers are extremely superficial anyways so either I take off my headphones and say a few words about nothing or i can just keep them on listening to good music while I have to shop for some bullshit.