Maybe when they use they are not having the same anxious feeling that the general public feels and they do not react to others who otherwise might be perceived as "more important" than them. This would appear to the person who typically views themselves as "more important" as arrogance or self importance...when in reality they are just mildly happy and don't care at that moment about the typical societal norms and ranking.
More than likely they are just going about their own business and not paying attention to how you are reacting to it. Every life has value...every person is equal.