Its not good to be lazy,especially at work
No, it's not.  Although Bill Agtes once said that it would be alright to give a lazy man a tough job, because he would find an easy way to do it.
disinclination to activity or exertion despite having the ability to act or exert oneself.
Yes a lazy person would be disinclined to give maximum effort.  So he would find a way to complete a task with minimal effort.  This would actually help others.
 1931 survey found that high school students were more likely to attribute their failing performance to laziness, while teachers ranked "lack of ability" as the major cause
Good on the students for ascribing it to their own failings, and shame on the teacher for thinking they were somehow "born stupid."
Sure ,teachers are to blame for students failure
Most of the time that's true.  Although I do remember some of my classmates who seemed determined to fail.