I'm sure there are exceptions like in your case. But in general yes, boys are born physically stronger. Your insults won't change those facts. But you know, you can have your own beliefs. That's the great thing about life. If you want to believe that females are physically stronger, or that there is no difference between men and females physical strength, you can do that.
You are acting quite immature with your insults here. If you can't even talk about these things without getting upset, maybe you are not completely objective here. Give it some thought.