People getting lax about distancing or whatever probably has little to do with masks and more to do with we're on month one million or something of this thing now.
It's not even conscious, there are times I get out of a grocery store and wondered if I've forgotten to distance while in it (with checking out I distance from clerks etc., but I mean just wandering around). Sometimes you can't distance. Probably not huge either way, your talking a few minutes exposure to an aresol virus where dose and time matters. But noone can keep up the level of fear driven high vigilance of the first few months that depend on 100 moment by moment decisions. They can just do their best, and do conscious things like put on a mask before going to the store, one decision, often helped by local laws requiring it.