How to cope with a disrespectful audience

Big mistake!
Well, normally, it might not be a mistake. It's sensible advice that most professional speakers give out. It's just that the speaker before me was so BORING that he zapped all my energy. As I observed the audience chatting, playing with their phones or PCs, sleeping and staring into space, I started to get annoyed with them. I felt they were not being respectful to the speaker.