Because Santa comes at night when everyone is presumably asleep in their own rooms AND only stops in very briefly, he is doing everything “right” from a social distancing standpoint. He will sanitize (“Santa-size?”) his hands after each house.
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Santa is really old, and old people are at high risk. Unfortunately, some flat-earthers didn’t wear masks at the mall earlier this year while he was there asking children what they wanted and he caught COVID. He was sick for a long time.