When the zombie/pandemic/alien/asteroid/nuke apocalypse happens, what mores, fashions, etiquette, traditions, etc won't survive in the future?

Like would thongs ever be a thing? Saying "Bless you" for a sneeze? What colloquialisms won't make the cut? Spanking kids?

Do you think any severe population reset would make preservation of the above non essential cultural flotsam and jetsum more urgent or would they see it as an opportunity to cull non-useful social stuff?
Preserve everything
Ditch it & largely start over
Preserve it but not continue usage
Freeze culture at apocalyptic era
Something else...
Select gender and age to cast your vote:
When the zombie/pandemic/alien/asteroid/nuke apocalypse happens, what mores, fashions, etiquette, traditions, etc won't survive in the future?
Post Opinion