I agree with you that they are not nice people if they are "lamping" people, but neither are the people going around sticking their noses into other peoples business and asking for trouble.If anyone is going around "lamping" people in the event of querying mask non-wearing, rather than just saying "none of your business" or "I'm exempt", then they are not nice people and deserve the prosecution for assault they would be in receipt of as a result. Maybe it would teach them a useful lesson.
It is not under any circumstance other than necessary self defence acceptable to "lamp" someone - no matter how offensive what they say is.
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I wonder if this is because York is extremely busy at the minute with visitors and staycationers.York city centre has signs up encouraging this, but almost no-one is going to take any notice of this request, except when moving between nearby shops.