I've been thinking about this recently. A colleague is participating in a group call and talking to someone I can't hear or see and that's just background noise

I've been thinking about this recently. A colleague is participating in a group call and talking to someone I can't hear or see and that's just background noise to me, I can easily tune that out. Another person tends to vocalize his thought process sometimes and it steals my attention in a hard-to-explain unpleasant way every time.