please tell me that why were boys considered better than girls????

In old savage times, women were usually confined to caves(bearing children most of the time, and they had to, as the mortality rate at that time was quite high and keeping the human species away from extinction itself was a struggle), and men went away to fetch food for all. That did two things, it made women dependent, and it widened the gap between male and female capabilities(physical as well as mental). This does not mean that women are inferior. But you see, if you dont let a young boy face the world and struggle like everyone, he wouldnt develop, physically as well as mentally. Once that happened, it became so convenient to males( who by now dominated) that they couldnt even let women think of any other arrangement. And all those centuries, they kept telling them that they were inferior to men in every way. Now, as we dont face extinction (rather we are threatening all others), it is quite easy to liquidate the system. But all that mental conditioning or brainwashing will have to be undone, and unfortunately that is a slow process.

Simple. Because people of earlier times doesn't know any better. They judged the women based on their physical weakness against men as being inferior. (^^,)

I think it is more about religion, because in almost every religion on the world, women has been picture like has a second place in a family, for example in the Christian religion women is show like was created from a part a male's body and it is almost owned for the man, also women are showed like the guilty for being expulsed from the paradise, I think it is even worse in Muslim religion where women are even more blame for things, so like I said it has more about region that other thing, also about discrimination in working I think it was more because more of the jobs were physical labor and not intellectual labor so, more would just would do that hard work, but now that more of the works is getting intellectual more women have been earning a place in the society, even in my country there is laws that protect woman and that require to be at lest 50% of women in the government.

All the 'isms' known to (wo)man are often based on insecurities, ignorance and fear.

boys are bettr than girls in many fields say strenght,job.sports etc..well one has to be better then only it makes for a perfect couples.but now girls are progressing.. who knows what will happen after few years.

God created males and females to have different roles in life. Neither is superior as you have said. The male was given the leadership role in the family. Some people think that just because they have a leadership role that they're better. That's not true. They just have a job to do like the people who are following. The misperception that men are better than women is disgusting and I know God hates it.

Yes,discrimination is everywhere.we must stronger and stronger than man then maybe we can change people's attitude.We need people know we are not worse than man.We can do everything man can do.