JBP is by no means perfect, especially when it comes to his social media presence as @elvismercury pointed out, but his views and his work stand on solid ground, imo.

I boil this issue down to a case of people reacting to their own reflection in the mirror that JBP is presenting to them. If intelligentsia are upset with JBP, a member of the intelligentsia himself, then they are likely upset that he holds contrary views or has reached a level of success that they themselves have not managed to reach. Either that, or it's just good publicity to opine about anything related to JBP.