Did you also experience that? Since I've noticed that eye contact makes me nervous or distracted, I stopped doing that and probably don't make as much facial mirroring as a result. I just don't see the point why I have to do that in every single conversation including talking to cashiers. And with people who I do like, they also seem to not make much eye contact either or push for it.
Or I won't talk, because I don't feel like it.
Or I won't talk, because I don't feel like it.