Avira >> so long as they are wearing a yarmulkah
I understand that there are exceptions to this also, such as professions where yarmulka may interfere with a mission or where one may be disadvantaged: legal, medical, government … We may see this less often in our times due to liberalism/multi-cultism, but in previous generations there were a lot of pretty religious people who did not cover their hats. It actually may be a sterotype among haredim, less knowledgeable than Avira, that this is MO MO (modus operandi): I was telling a hevrusa a story how someone in rural South reacted to my yarmulka, and he was genuinely surprised that I was wearing one at work there.