[oddlyoblivious]

People /hate/ being told they are wrong usually, and often you'll get a lot of 'well intention-ed' bad advice. I would say to ignore it, but it's harder when you live with them. Velma's suggestion is wonderful, it gives them a way to save face.

Depending on what your relationship with this person is, (parent, Significant other, sibling, roommate.) It may be easier to set healthy boundaries. Keeping Sweep some where out of sight and out of mind so to speak. That way that well intended advice can get dropped in lieu of some other form of conversation.

It may also be easier just to change the subject and deflect.

If all else fails imagine shoving that person in-front of a horde of zombies. It might not help but you can smile while they yammer away.