Insincere.

There are people who only talk to you not for you. They talk to you because you serve a specific function for them. They pretend to like you for who you are. Don't let their façades fool you. Wake up. They only talk to you because its convenient for them! If you realize people are using you, end the toxic relationship. It will only hurt you in the end. And if they try to make amends, don't let them. Because the only reason why they don't want to talk to you is because they want to be liked. And in turn, they'll shine your shoes and kiss you tush. But to be perfectly honest, when they have gained your favour, they return to treating you rudely. Trust me. Most people are like that. There are people who would like to believe that the world is wonderful where the people are born good. Truth be told, it isn't always true.

On a side note, just a word of advice: There are some people who are good. BUT if your personalities don't match, friendship isn't possible. In these situations just being around each other can bring out the worst in both people! It might sound odd but it can happen. They seem like jerks but its just a clash of personalities. That is what a social interaction is. Even if 2 good people meet, it doesn't ensure a bond. There are just too many social variables. So the other party might appear as insincere, aloof or whichever negative personality trait, but in fact, they aren't. They are good people, they just don't fit our own personal definition of "good". And then because of a silly impression, the truth is shrouded in a cloud of opinion and perception. Sad, isn't it?