Most of the middle ages probably wasn't that bad, but the civilization-destroying plague destroyed civilization, and Renaissance-era propagandists exploited the living memory of the plague to make themselves look better.
And traded notes with other sellers.
Usually accompanied by large in-corridor vendor displays which further obstructed already-crowded walkways.
I stopped going to malls.
High-street shopping districts still don't affect me to the same viscerally-negative degree. Even those which seem to be fairly consciously emulating and attempting to create a mall-like atmosphere. There's something about the open-air nature, and the fact that sounds attenuate rather than echoing off hard surfaces from all sides.