I have a scratch built mame cab, which I consider of moderate quality, and I consider it to be above average compared to most project cabs that I've seen posted online..... and still, if you find the market where mame cabs sell for $3000.... and maybe mine will fetch half of that, you let me know.
Oh, and I stand behind the argument that even they guy with the shittiest attempt at a cabinet deserves the respect due to at least making an attempt, because what he learned doing it will help improve the next attempt.
....but I also see that it's common to loose the respect of others for not being aware of how good or bad your abilities are in the eyes of others. In this situation I encourage everyone to take the high road and just let the victim continue on his way. It's obvious that he's out to lunch. You gain nothing by pointing and laughing. Think about it. Do you do it because it makes you feel good about yourself, because it highlights that you're better than someone else or that you know something that they don't? This guy's status is completely obvious to everyone in the literate audience. Now ask yourself, does your ability to point out the obvious really make you look better in the eyes of the literate audience?
Make the world a better place. Take the high road.,