1. My comments are directed at you (in other words, I include you in those I call lazy) only if you do not make an effort to prepare for job interviews, including some of the common sense advice listed by other members.
2. Social interaction does come naturally to many people. My own mother was one of these, which is why I have the fraction of a clue that I do. Balancing a checkbook, on the other hand, she was hopeless at; fortunately we had my father. I have cleaned up my share of F or S or even NTP messes, though they no doubt were different in nature from what you have dealt with. People are all different, with different gifts, inclinations, and blind spots. That is the whole point of MBTI, though it doesn't require any knowledge of personality theories to recognize it.
3. By your logic, I am also lazy about yoga, blacksmithing, stand-up comedy, creative writing, and a host of other worthwhile pursuits that I do not choose to pursue. Life is short; time and resources are limited. I therefore focus my efforts on activities of greatest interest and utility to me. This doesn't make me lazy, just selective. I cannot do everything, and I am not about to work on weaknesses that have limited impact on my daily life, at the expense of strengths on which I depend constantly. The difference between this and the lazy job-hunters is that I have no expectation of getting results in an area where I have invested no effort. If getting results there becomes a priority, I make the effort and develop the relevant skills.
Bottom line: while there is some validity to your criticism of INTJ social skills, and most INTJs would acknowledge that, it is incorrect to equate that with laziness. It is more often based on a conscious choice to direct one's efforts elsewhere.