Like you said, it’s about arbitrary norms, but we make assumptions about others all the time based on which norms we follow. An analogy from a different angle is that texting your Tinder match from an Android phone is a bit like applying for a tech job with a @hotmail.com email address.

[0] https://slatestarcodex.com/2014/09/30/i-can-tolerate-anythin...