my random vs others random

My random thoughts are just that - thoughts.  If I speak them out loud, then people usually just laugh at me and go on their merry way.  But I have noticed that other peoples random thoughts aren't just thoughts at all.  They are just a way to start an argument.  Why do that?  Doesn't it seem like a dumb thing to do - start an argument about NOTHING!  Why put all of that pressure on yourself, or others?