Step back today. Notice all the judgement happing to you and by you. Notice that sizing up and down glance a friend gives you when they first see you. Notice how commercials pass judgement on those who don't partake in their product. Notice your own opinion being offered on how someone else is doing something.
As you observe yourself, consider how ridiculous it is to be worry about what another human being thinks of you. Consider how ridiculous it is for you to offer your own summary judgement.
If you offer glib refrain, "Oh, I don't care what other people think", you probably felt judged by me.