The issue is not that you raised general questions, but in the manner in which you raised this questions. I don't even think I'd like Mongello on a personal level, but I think your methodology was flawed.
Honestly, due to the subject matter at issue, I don't think there could have been a different way for me to raise the same questions and not have somebody feel like they were "accusations" or an "attack." Maybe you wouldn't have had an issue with my methodology in that case, but I'd bet the post would still have drawn a negative response or two.
There's not really anything more to say. I think it's clear that my original post simply comprised the thoughts and questions that occurred to me from looking at Mongello's websites. But once someone gets it into his or her head that something is an accusation or an attack, it's pretty much impossible to disabuse them of that notion.