If the boss deserves a negative assessment then he deserves to get one. The mistake that the OP made is believing that HR is there for low level employees and putting his true feelings on paper.
Always remember that HR is present to safeguard the company. They will look after the manager more than they look after you because he is, to the company, much more important.
OP: you need to learn what I learnt during my time in corporate America - focus on getting what u want instead of focussing on being right. When your a startup founder you can work on creating a better workplace. For now though focus on getting along with the boss. It's a way to make good money and it's a great skill to have - being able to work with difficult people.
Always remember that HR is present to safeguard the company. They will look after the manager more than they look after you because he is, to the company, much more important.
OP: you need to learn what I learnt during my time in corporate America - focus on getting what u want instead of focussing on being right. When your a startup founder you can work on creating a better workplace. For now though focus on getting along with the boss. It's a way to make good money and it's a great skill to have - being able to work with difficult people.