Thanks for the nice answer. I see it the same. I can imagine this is a cultural thing, and if you have that many bad experiences with customers, I can get why you have a prejudice of someone knocking at the door, but as you said, there still are important reasons why someone might do this, and you never know their true intentions.

However, I originally didn’t think that they were aware that the store is closed (I experienced the same when a store closed earlier than stated on the sign and online), in which case it’s just nice to explain them. But if they knew about it and just wanted some personal acknowledgement or even trying to still get served, of course that’s really awful.

(I also edited my post to make this more clear).