positive discrimination?

We have been talking about gender roles and issues for 2-3 weeks but I believe that we missed an important point. In our class, we somehow looked at the gender issues as a great problem for girls (it is indeed) Except the tough guy look issue for boys, we usually looked at how girls portrayed weak and delicate. However gender roles do not have only bad consequences. There are some examples where girls are positively discriminated. For instance, I personally tend to behave much more thoughtfully when there are some girls are around me. Very simply, I start to use fork and knives while eating rather than stuffing the food into my mouth as fast as possible. I tend to curse/swear less frequently etc... I mean, well, it is good to make girls more independent and powerful but sometimes the defenders of this gender issues can be funny. In our modern world I believe that girls are not in a such a bad situation and there is no need for such fuss. Some feminists exaggurate it soo much that even thoughtful people like me can be irritated about it. Do girls really want us to be the disgusting people we are when we are all boys? If yes why was I always bothered to act properly for my whole life?