Faking?

A lot of people tells me that everyone is a two-faced to some extent, I agree on that.
^ prove me wrong D: I feel like this is a bad theory in a way.

Do you "fake" a lot?

My friends tell me that I am super obvious when I try to fake, as in laughing and being friendly to a person I dislike.
That was long ago, now this school year, I don't like someone, then I don't talk to them or speak my mind.

Honestly IMO, if I dislike someone, why waste my time pretending to be their friend? So I get the reputation of being the "meanie" in the group because I bluntly show my dislike towards someone by either ignoring them or commenting directly towards them.
Then my other friends tells me behind a person's back how they hate them so much, but when we hang out with the person, they act like the best of friends. They tell me it's all about being fake.

Even so, there are people whom I don't really get along with, but I try to be friendly and talk to them. <- I don't consider that as faking since I do want to be nice. But if the person is the ones that gets on my nerves or just annoys me, then I'll just talk to someone else or speak my mind.

Recently I apologized to a girl I have ignored for months because of her BOYFRIEND's (now ex) problem with me. But really, I didn't have a reason to dislike her. So I apologized one day for ignoring her, and I told her I don't want to act like a fake, so I didn't talk to her because I don't talk to people I don't like. I also mentioned I guess I didn't like her because of her ex-boyfriend because we have had some past problems.
She forgave me, and liked how I'm so honest and came full out on everything. We're awesome now. I talk to her a lot ^^

I've had a few friends who told me that the world needs more people like "me". I guess what they mean is people that doesn't intend on acting like a fake. But in someway, isn't that bad either? Cause then we would be considered the cold-hearted people, right? No?