A320 pilot reports being left on a heading after departing ORD up to cruise altitude. When ATC is queried about the heading; the Training Controller provides a sarcastic answer.

Narrative

Shortly after takeoff from ORD we were assigned a heading of 275. After two frequency changes and multiple climb clearances we reached our cruise altitude of FL340. I wanted to make sure our current Controller knew we were still on an assigned heading of 275. I asked if she still wanted us on the heading. She said yes but you can have direct if you want a short cut. I said yes; whatever will work. I'm just checking because I'm not used to being kept on a heading this long. I was then assigned a reroute. At this point a male voice asked if I had time for a question. I said go ahead. He asked 'Have you flown out here before?' I stated I had. He then very sarcastically replied 'Well then you have been kept on a heading this long before.' My response was an exaggerated; 'Well excuse me!' The fact is I have been left on a heading on that departure and forgotten about numerous times. I didn't like his condescending and confrontational demeanor. I asked for a phone number to contact him. He gave me a number. I then asked for his initials twice. He kept silent. Several hours later I called the number. I spoke to a Supervisor and he explained to me that he thought he knew who it was and that training was going on. The male voice was the instructor. I am reporting this because I do not think he displayed a positive role model for his new student in training. I attempted to enhance communications. He attempted to disparage communications. It is lack of communication between pilots and ATC that lead to disaster.