He’s not so tough now. Cops have arrested the monster who they say repeatedly kicked a cowering elderly woman in the head aboard a Bronx subway train — as callous straphangers did nothing more than pull out their phones to record the beatdown. But the suspect, restaurant worker Marc Gomez of Yonkers, is denying he kicked the woman — even as he insists she came at him with a knife. **SNIP** Gomez 36, was charged with felony assault and ordered held in lieu of $30,000 bail after prosecutors said he has a misdemeanor conviction and an open gun possession in...