Citation needed. I don’t believe this happened, much less “plenty.”
When the government & many major institutions are discriminating against one segment of a population (despite a lack of scientific basis), it’s not a stretch to see that as, at least implicitly if not explicitly, sanctioning abuse of that segment.
I will grant you I have seen ugliness from both sides of the mask debate. I’d say there have still been more maskholes on the pro-mask side. Too many Karens. Also, again, there is no systemic discrimination or denial of service (except maybe in some very fringe anti-mask-owned establishments) to anyone wearing a mask. Almost all anti-maskers don’t care if people choose to wear masks; they just want that same indifference given to them.