you had a long hard week. Then your husbands friend, just had to get, 'confrontational'? Sounds like, he wanted to 'debate' something, hence, 'you're wrong, let me count the ways', and he's more open minded, which these days, it's insulting to be referred to as close minded.
So, husband was embarrasssed because, of what, again? Clearly, didn't tell his friend, to back off.

Would it had been better, to stand there and 'shut down', which is equivalent of walking away.

Walking away, good call

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