If you have colleagues with whom relations have not developed, it is necessary to take action. The easiest and most effective option - make them your friends. Of course, this is not easy. One can not do a favor or a tea bag. First of all, understand your hostility.
If it is mutual, then decide for yourself, start overt action or to accept their feelings and try to find a compromise. If you do decide to keep the peace, to develop tactics. Straight talk here, most likely, will not help.
You need to prove to your opponent that you are a person and a good worker. Then, perhaps, his attitude towards you will change. Smile more often. Even in a quarrel, even when you've done something wrong. Disarming smile. Try to be helpful to your colleague. Help him to work. Learn his hobbies and interests and talk about it. You can pretend that you are very interested in this issue.
Well, if you make friends with a colleague could not, start the fight with him. And you can use it as a weapon. If a person makes fun of you, respond in kind. If you talk about incompetence at work, find his mistakes.
Any action react with humor, do not get mad, get mad and curse. This does not lead to anything. Try not to give rise to humiliate yourself. Do not violate labor discipline, always look neat and tidy. In general, do not do anything wrong. Then your enemy will be harder to hurt you.
No less viable option will complete disregard. But it will require your maximum exposure. Just stop responding to all the actions and words of a colleague. When the opponent is indifferent to conduct military action is useless. Yes, to be held not a day or two before the emotions calm down. But it's worth it. After all, the fight will end.
Of course, you too can behave aggressively. Report to the leadership of the error of your enemy, to humiliate him with the team, making fun of his shortcomings. But such behavior only ignite the fire of enmity. And you will have an implacable enemy for life. This behavior - the lot of stupid and weak people. Be strong mentally, and then flatten the conflict victory will be on your side.