some people reacts many time?

yes ,but percentage of this kind of people is very less ,they are dissatisfied people,they will always be unhappy

It is very difficult for me to judge with this type of people who reacts many times.Some time I get irritated.Some time disgusting and hurting me lot.I have one friend who reacts many times which really tougher me.Some time he talks in such a way that shows he is really good friend but with out reason reacts in such a way which really disgusting and hurts me.I think if my friends reacts many times with other he may live all alone.

You cannot really judge these kind of people. It might be something in their past that made them become what they are right now. This person might have been hurt too many times before. It is his way of defending himself. In fact, just a keyword could trigger that defenses, so much so, that he will immediately react to what you said - unreasonably. All reasoning will shut down, and what's in the front line is his army of defenses. It's like one raise of a sword and all his armies are in battle position. If this happens, it's pointless to speak to that person while he is still emotional. Don't force the issue yet. He'll never listen at all. It will only end up into heated arguments. Just wait until all his defenses are down and he has calmed down before you open up the issue again.