Radio 5 was doing a vox pop of young people to see how much (or more accurately how little) they knew about the situation in Gaza. Most admitted to knowing nothing or next to nothing about it. Undeterred one young man still attempted to give an opinion. He described the conflicts as:
"a frivolous waste of time"
The OH entered the room at this point and understandably had to ask what the subject was.
Frivolous is not a word I'd use to describe it. Frivolous suggests an activity like shopping for a new hat or spending all your money on cake.
I think he may have meant futile.