What standard of behaviour can be inferred in a contract of employment?

So, Seamus, just on that we've been talking about members of the public not being kind to employees. We move on to our next topic, which is more about employees not being kind to members of the public. We kind of flipped it a bit. We're going to show you a short video of this particular incident. It's a gentleman, shall we call him, in Scotland who previously worked for the Royal Mail. You may have seen it circulating on social media. So we're asking the question, what standard of behaviour can be inferred in a contract of employment? So where's that line between just expecting people to be decent human beings? How can we . . . and dealing with something contractually, is it a disciplinary