Old, white-haired man picks on young, fit man - must be mad.
No. Wrong is every respect. Pardew is a manager of a squad of young men and his reaction when they are working is to head butt an opponent - and it was, for me,. a clear head butt.
That is a clear and immediate sacking offence. He's broken his contract and he should be told to leave his car keys, clear his desk and GO.