Is this bad though? I'm doing the same. I find the main conclusion and skim the rest to make sure it is supporting what I think it should be supporting.

Because of the wording "When he sings" it leads me to believe he doesn't like holding his phone only when he is singing. The only conclusion that we can draw is that he was not singing "The Lazy Song" when he picked up the phone. He could've stopped singing the song right before the phone call or he could have started right after hanging up.

I'm also learning with you so I could also be wrong :P