I'm not sure blowing a kiss and calling someone "a f**king ?????" classifies you as a nutcase. It was clear something went on in the tackle on the ground that Hardaker took exception to, a few others might've gotten into a punch up or kicked out when on the floor and gotten themselves sent off or binned which would be worst.
He's had inappropriate/questionable language and an eye gouge that was clearly accidentally, and thinking he was on an off day during England camp. Whilst it shows a pattern of getting into bother and him not being the brightest button, it's an OTT reaction brought on by the faux outrage of others to think of him of a nutcase with brain explosions.