When someone displays characteristics of being a fuckhead we can refer to them as having a level of fuckheadness. Similar to fuckheadedness, this is usually someone who's head is fucked, deranged or may have a numbingly low IQ (see also: dumb shit).
Background Information: My experience with the manager of a gym I enquired about joining who wouldn't let me inside to check out the equipment and space until I registered my personal details and agreed to their T's&C's first. This was in fact an agreement to become a member at the gym. (Would any normal person join a gym without seeing inside first?) He also had no idea about what was in this policy. When I tried to uncover the reasoning of such a stupid policy, he increasingly argued his defence with me about it, talking over the top of me on a tangent which was not addressing my main concern. He also suggested that because I wasn't cooperative with the policy that I was the one who may not be an 'appropriate fit' to be a member there. He handled the situation with high levels of fuckheadness and should be communicated to at the same level as his intellect.
He displayed a high level of fuckheadness.
You were really showing your fuckheadness tonight when you did those fucking stupid things, you dumb shit.