Recently I interviewed someone and kept hearing another conversation at the same time. I finally asked him about it and he said "oh yeah that's my wife doing a meeting, let me go to another room." It's hard for me to imagine someone's throught process that led them to think it's fine to have the conversation with another meeting in the room when there was another option easily available, but it was a quick "tell" that this person has bad judgement, low empathy or simply doesn't care - none of which made me want to hire him.
To a smaller degree I judge people's technology. I am interviewing for technical roles and if you are a year+ into WFH and you are still having silly wifi issues or haven't figured out how to sound clear on your mike, it's a bad sign about your ability to troubleshoot and solve problems (or again, low empathy - if you care that your video constantly stutters and your colleagues can't make you out, you'd figure out a wired solution or upgrade your router or whatever)
An interview is an assessment of your capabilities and there's such a thing as basic competence. If you can't nail Zooming after so much time, the whole thing is a little suspect.
I'd take a very different attitude if I was hiring for a non technical roles where solving tech problems is far remote from the job.