I kinda like players when they speak up, speak their minds and express how they feel.
This aspect is one of the elements I can identify with.
I do not like players who keep quiet and "go with the motions". Politically correct terms, these are players classified as "the good soldiers".
The key, as far as Jeff Green is concerned, he should try and channel his frustration on the court, against the opposing teams (not in a violent way).
I don't know Jeff Green or Brad Stevens, but look from the outside in, I find these two are very nice people, "good guys".
Sometimes, on the court, there isn't room for the nice guys. Sometimes, "beast mode" is a necessary attribute.