Then, why upload it for public consumption? I think if people are going to make negative comments on a build, they are going to make it on that build, and not on the wall, at least from what I have seen. It's more specific that way. "This sucks' would make more sense, on an individual item, which you cannot turn off the commenting for.
I do understand taking the negative personally. I do, too. Trust me. I take a lot personally. But, again, you cannot turn off comments on a specific build, so, turning off comments on your wall, will save you no pain. Nor will it stop people from commenting positive or negative. The only way to do that is simply to save it to yourself.
So, I still don't understand. I will say, I have mentioned it to more than one person who did not even know they were doing it. It's not off by default. Most have turned it back on, not knowing that they turned it off, but some have responded as you have, that some people are mean, but, 'beating a dead horse', you cannot turn off commenting, positive or nagateive, on a specific upload, if you share it to the community at large. So, turning off commenting on the wall saves you from nothing. No?