[ElProximo]

Marcus is angry at himself for not living up to the imaginary heroic strong superhero he invented for his 17 year old self.
He has to get rid of that 'contradiction' by putting it on other people. People who are stronger than him. The other younger HMs.
but,
BB Diary room works because there is no threat of physical violence while he is in there. Actually he is safer to tell people to 'fack off' than anywhere else.. and he just bites into it.
Look at the seething snappy hate in his eyes.. I mean the childish way he relishes it up... knowing he can tell someone they are a 'wanker' or to 'go fack themselves' KNOWING he can't get beaten up.
He thrills in it.
He is ashamed he couldn't man up to Siavash over nominations so he has to take that out on someone else.

He is a coward that gets sick glee out of hurting the few people smaller than him.
Really.. this guy is one of the lowest types of people there are.