As a worldwide operator and regular visitor to JFK controllers are probably the rudest, most belligerent in the world. They shout at aircraft who don't understand their machine-gun like transmissions, even though the pilots clearly don't have English as their first language. They are sarcastic and aggressive on all frequencies particularly on GMC and god help you if you ask them to 'Say Again'.... even as an Englishman! There is a level of arrogance and readiness to bully pilots into accepting questionable clearances that you find nowhere else in the world.
I find IAD and PHL are similar in attitude and there appears to be the belief that theirs is the only and best airport in the world..... and you are simply an amateur. They are all blow-hard bullies.