We all have our flaws

I can bear with stubborn people, arrogant people, mean people, petty people, cruel people, stupid people, silly people, naive people, even hysterical people (to a degree, I reckon). But don't ask me to bear with optimistic people. I can't stand them. I'm not yet sure if their delusional belief that everything will eventually turn out well makes me want to puke or to smack them.