I imagine most people, myself included, feel very uncomfortable at a job interview. Still, you have to understand it's one of the things you just have to do if you want the job.
There are a billion reasons why the interviewer may have been pushy. Maybe he had a bad day and enjoyed his position of power, attempting to terrorize you. Maybe it was part of the game, testing how you react under fire.
Getting all worked up at a job interview is bad. Assuming you want that job (you probably do, otherwise there's no point in going to a job interview) you should think about it not as a challenge but rather as a simple conversation. It's all about getting to know each other. While the employer wants to learn more about you, take the opportunity to learn as much as you can about the job so as to avoid a possible disappointment in the future.
If they try to push you my advice would be to keep calm, don't show that you're upset (let alone angry, that's a big no-no). Stand your ground and if it gets intense, let them know you've got a pair. Who knows, maybe that's all they wanted to find out in the first place.
But in any case, DON'T get too worked up because of a job interview. You have absolutely NOTHING to lose. But you have a job to gain - if you play your cards right and if the luck is on your side.