Being a shithead can manifest itself in many ways:
If your friend says something offensive, and you don't call them out, or you only gently scold them so you can stay on good terms - you're being a shit head.
If you're criticising people behind their back, or holding your tongue in a meeting, and gossiping later - you're being a shithead.
If you're letting people off lightly because what they say doesn't personally affect you - you're being a shithead.
If you're demanding special treatment, while expecting others hold themselves to a higher standard - you're being a shithead.
If you resort to personal attacks, instead of arguing against an incorrect point - you're being a shithead.
If you hear someone state a falsehood as fact, and you don't correct them - you're being a shithead.
If you're at work and you're not agitating, and showing no concern for the well-being of others - you're being a shithead.
If you see someone harming others, while you do nothing to stop them, and do not try to reason with them - you're being a shithead.
If you do the bare minimum, with no direction, plans or goals - you're being a shithead.
If you consider yourself a veteran, better than others around you, and above menial tasks, - you're being a shithead.
If you're aware you've made a mistake, and you do nothing to correct it - you're being a shithead.
Being a shithead might keep you comfortable and safe, but you're doing harm to those around you when you engage in these behaviours.
If you're being a shithead, do not.
The list of 'terror groups' i can find on the uk websites havent been updated to include palestine action, and they obviously also don't include any of the descemdents of the british national front
normal day in the uk then