Maybe I'm missing something here, but I'm struggling to understand why the F/O is coming in for so much flack here. OK, by some accounts he might allegedly be a 'difficult type', but that doesn't alter some important points:
1. It seems the whole mood of the flight was set by the captain calling the F/O his bitch before they even started engines. Now this is not clever, not in anybody's book, under any circumstances. Unless you know someone really well, and are on VERY best terms, with a somewhat childish 'school playground' level of 'humour', you must be prepared to pay a high price for such a stupid remark. He did.
2. It appears the captain chose to ignore the F/O's suggestion to avoid a cell which he later apparently admitted was worse than he expected. By doing so, he put everyone at unnecessary risk, including the F/O, who clearly didn't want to be subjected to the avoidable weather any more than the captain's insulting, juvenile, patronising 'humour'.
Although it is reported that the F/O's subsequent behaviour was not ideal, after the captain set the scene with these two large errors of judgement, it is totally understandable. Anyone would feel aggreived after such disgraceful behaviour shown to them, behaviour completely unbecoming of a professional pilot, which has no place on a flightdeck.
Sadly there are too many of this captain's type, though now there is one less, and rightly so, with judgement that poor.