I have always had a personal rule that 2ft is close enough, and that was before the interference of COVID. I never accept anybody any closer to me than that. The rough guide being that if I can touch your chest then you're too close.
I get the occasional sideways look from people who seem to think that breathing in my face is their right, but really it's never given an issue when I politely mention my personal space requirements.
Even less chance of an objection now I should think.
And my experience is that if one doesn't mention it, the other person will simply move forward as their victim steps backward. So I mention it.
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