Why must all the fun stuff be considered boy stuff?

So I'm at lunch yesterday and we were discussing an upcoming camping trip to go dig for fire aggots and visit the hotsprings in Safford. I was excited. I was going to get to dig in the dirt, jeep and Bryan and the boys were talking about renting dirtbikes and whatnot. This meant I was going to get my own dirtbike to play with and I was really excited. The subject of their wives came up. Apparently their wives aren't going. I told them I didn't want to go on another sausagefest camping trip and wondered why their wives weren't coming. They talked about how their wives didn't enjoy noise, or dirt, or atvs and I was then told if I want to do boy things then I have to hang out with boys.

I was a little confused by this statement. First of all I am probably the most sterotypical "girly" of all of these women. I wear skirts, get all dressed up, love to shop, knit, bake, garden, sew, and know emily post backwards and forwards. I go to the theater, and the symphony, and the artfest. But I also motorcycle, dig in the dirt, smoke cigars, and drink scotch. I can carry on a conversation about early childhood development and then in the next sentance talk about the construction of a building and shooting guns. I'm a pretty well rounded person who is always ready for adventure, so why did I feel like my femininity was attacked because I want to do these things? Why is there an assumption made that these are boy things to do? And why is it that I want to call up my parents and thank them for not establishing boy things and girl things in my life? Sorry my inner feminist is showing.