I think I know this word sinice I've learned English. 

but I guess I have been knowing totally wrong for more than decades. God's sake. 

I just had to look at dictionary again for the exact meaning of it. 

because I found someone called me an insane women-hating troll. 

Of course I am not. but  I understood why he insulted me, just right after I looked dictionary again. 

This is what my dictionary says.

"If someone calls a woman a bitch, they are saying in a very rude way that they think she behaves in a very unpleasant way."

Boom!!

It didn't say 'a bitch is a snobbish woman'. but I knew this way. I was absolutely wrong. 

Which means consequently I insulted all women now. because 'a bitch' in my words can be anyone. 

I was actually trying to comment someone's discussion to defense American woman and also cheer him up and correct his generalization.

Because I always though American women have a good manner.

but what I have got is such an unblevable reputation as an insane women-hating troll.

Someone gets me this reputation seems very a decent and nice guy. I am sure. I could know it from his comment. I wouldn't consider to look at dictionary again if he didn't call me a troll. I couldn't even think about what is wrong with me. 

Thanks, I've learned. 

I am still wondering how do you say or call such 'a snobby, lavish and bad woman'

Well, I often hear 'she is a good lady/woman or she is a bitch'.

so I thought a bitch is only for those who I mentioned as a bad woman.

so I would like ask you in really polite way.

What does exactly mean by 'a bitch' in native way? 

P.S.

By the way, my comments are all disordered. So It got worse. looks so different. lmao

Please, Don't judge too quickly. I am still learning.