Short or Long Hair?

I start of every morning with a language review, where my students have to correct sentences or answer questions. This week one of the questions was this

Fact or Opinion: Boys look better with short hair than with long hair.

One girl raised her hand and said, "That is definitely an opinion."

Another girl quickly thrust her hand in the air. "But, it's also definitely a fact!", voicing her strong preference.

I had to smile and stated, "Well, it is a definite fact in your opinion."