Social distance is impossible to force. If you force people at every turn to observe their distance from each other, to constantly make sure that they don't step on each other's toes, you have a bunch of nervous, cautious, tense and deeply annoyed people who will sooner or later scream at each other.
Could it be that what you experienced, the man found an opportunity to show his frustration at the butcher's? We humans constantly show our frustration to each other when it gets too much for us. Who else should we show it to, if it is the public we inevitably have to go to in order to shop? How can you even be meant personally?
I happened to have ignored other peoples spaces. That just happens. But can you say that space ignoring is the rule and respecting it the exception? I would say we are usually all very well behaving without pandemic. Corresponding with the inherent cultural distances we learned.