That is pretentious thinking because to begin with it's really none of our business whether OP is lazy or diligent. The role expected of other HNers in a show HN post is to consume the work and provide some feedback. Not to dig deep and make assumptions about the OP's character without even knowing him.
Hence my suggestion, keep it short:
Example:
"There's a bug on the contact page."
Instead of
"There are so many bugs in this application, I can't believe anyone would put it on the open Internet. It is just asking to be exploited."
Each of us is an individual human being and none of us knows any better how to behave or live life than the stranger on the other end, especially after most of the details are stripped as we are communicating through a thin layer of text, much of reality is lost in translation here.