What should I say to my boyfriend in this situation?

My boyfriend doesn't want me to handshake the opposite gender. I understand and am totally okay with that. But there's some situations like suddenly happens and you might not be able to dodge and don't know how to handle those times. For example, we were on holiday and hired airbnb from a couple. This couple took us to the flat and gave us some information about the place. While they were leaving the woman shake my hand and my bfs hand, then the man also shake my boyfriend hand and my hand. My boyfriend told me that he didn't like that he shook my hand and also the woman shook his hand. And months later still he's angry about it and doesn't want something like that to happen again. I just wanna comfort him about it but i don't know what to tell him. How can i avoid situations like that... is there any couple had this kind of situation, any advice would be appreciated, thanks in advance.

What should I say to my boyfriend in this situation?
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