why people easily complain?

It seems there having a bad day, don't believe in them selfs, low self esteem. personal issues

i think some people just enjoy complaining if im honest i cant see any other reason for the serial complainers out there, and there are pleanty of them lol! it may be because they having nothing better to do with their lifes than moan all the time!

What do you mean by complaining in the simple things in life? I actually think that what you just said is a hasty generalization. Regardless of almost all of the people of the world complaining, I still believe that there are few who appreciate these 'simple things'. More so, complaining is good (sometimes). Because I do think that this signifies us knowing and wanting something better. If all of us liked everything as it is, then improving it serves no purpose. Doesn't it? When we complain for because of heavy traffic, it's because we know it could be better. Although this doesn't mean that we should complain. (I'm not promoting it) I'm just saying that in an optimistic note, this may be the reason. :P