Who´s a bitch?

My good friend & I were in the town sittin in a caff, when a very fashy dressed up & pretty gal passed us. At once, my friend shouted out "What a bitch!"
I gave her an obtuse look & had another look at the "Bitch" - why did she call her the bitch? She answered me this:
Bitch is:
- the girl who puts on a lotta make-up
(& what!? I also like make-uping myself!)

- the girl who can buy designer clothes bcoz her lover gives her money
(I buy d-clothes coz they´re made well!)

- the girl who uses bad language
(I disagree, a lotta teenage girls do it too, coz they think it´s cool)

- the girl who wears high heels
(WTF! I can´t wear strechers coz my feet hurt me in em!)

- the girl who had many lovers
(I agree)

?Am I also the Bitch? I asked her but she couldn´t answer me other way than NO. & here´s a list of my description of the real bitch:
- she sells her bod every nite on the street
- she is poor
- she doesn´t have a lover who buys her expensive thangz
- she is uncultivated
- she has 2-3 customs a nite
- she is very vulgar
- she´s undistinguished during the day

So, why do girls call the other girls "Bitch"? Bcoz they just envy her/em - that´s all. I can´t remember when I lately called someone B...it should be used a prostitute word...