Is it normal my mom thinks this?
Whenever bugs get into the house she will deny that they got in through the walls. She usually thinks something like the cats brought them in or they were on somebodies clothes or stuff and came in. Today there was a trail of ants going from the bathroom wall to the hallway and she believed the cats brought them in even though they were obviously coming in through the wall from outside. When I pointed this out she replied "Not my walls".