Yes, it is incredibly stupid.

"You didn't take a shower? Your arm pits must STINK!"

• "Well, I washed those with soap and water in the sink."

"That's DISGUSTING. You must stink."

• "Well, no, what I'm explaining to you is that I washed my pits with soap and water, the same way I would if I were in a shower."

"I'm sure people are just too polite to tell you."

etc.