The world says the road is rough. What does ex-boyfriend Tik Tok mean by punishing others for riding donkeys?

People say the road is rough. Others ride horses and I ride donkeys, which means: people say the road is uneven, but others ride horses and I ride donkeys. Don't stare at people who are better off than yourself. There are still many people in this world who live worse than themselves. It embodies the indifferent and cheerful attitude towards life.