I could care less if he was a walking, talking and typing encyclopedia for any and all automotive information, and nobody called him dumb. Fact of the matter is just like you said. Not everyone knows everyones business, and they shouldnt. I dont make 90% of my work public becasue I dont need to, I have nothing to prove to anyone other than myself and my customers asking for quality work.
It is, becasue you are hopelessly clinging to something worthless. Anyone can say anything they want about what they did or want to do with their time and it shouldnt consern anyone other than themselves or parties DIRECTLY involved. AKA not you. Just drop it already.