I tend to hold it open if someone is relatively close. If the person doesn't even acknowledge it and just says nothing after I hold it open for them, the second set of doors I don't even hold it open.
I find this happens to me quite a lot whenever I'm at a Chinese supermarket like T&T. One time I did that, it slammed right into some mainlander lady since she automatically assumed I would hold open the second door for her. I guess next time she should learn to say thanks.
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