What is the behavior of women that men cannot understand?

In SBS 'Live $10,000 Quiz Show' aired on the 9th, the 6th round question was 'Behaviors of women that men of age 20~30 cannot understand'.

The choices were '1. Going to the bathroom in groups 2. Trying on a bunch of clothes and not buying anything 3. After talking on the phone for an hour, saying they will discuss about more details in person, 4. Say someone got prettier as soon as they meet'.

For this question, Mir talked about the action of his older sister Ko Eun Ah that he cannot understand, which was that she wears unmatching underwear. He said, "She doesn't match her underwear. She wears different ones for top and bottom. It's so weird", surprising many at the set.