I would expect that an experienced leader would have learned the lesson that the satisfaction of writing a nasty comment is short but the consequences are much

I would expect that an experienced leader would have learned the lesson that the satisfaction of writing a nasty comment is short but the consequences are much longer, not sure if he just can't control himself or maybe he enjoys the spectacle and making himself a "victim". The guy is paid for his work so I would have expect he would act more professional, the excuse that he works for free in his spare time does not apply.