Also this is a part of social etiquette! You have to be polite to people even of you dislike them because it prevents unnecessary tensions and drama and doesn't rope other people into the feelings you have. Just because you and your coworker don't have a good relationship doesn't mean you get to treat them like an asshole, and especially in front of your co-workers who might have a good relationship with them. If they're openly treating you like an asshole then you can confront them about it but that's honestly better off left to HR in a lot of cases.
It's not lying, it's creating a more comfortable work space. The same goes for other scenarios. You might be in a friend group and a friend of yours brings someone you actively dislike to a group hangout, but your friend is friends with them. Telling them what a bad person you think they are or telling them exactly how much you hate them only makes the tensions between you two worse and makes your shared friend uncomfortable (IE pressuring to choose sides) and the rest of the group upset.
Say you're invited to your friend's birthday party and your friend invites someone you hate. You can complain about all you want later in the privacy of your home or with other friends or family but confronting the person at the party just means drama and anger and it ruins the birthday party for the other person.
Now if it was your party and your friend brings the person you dislike over you have every right to be upset and ask the person politely to leave. After all this is your party, and you likely sent out a specific guest list. But when you're in a space that's like a work environment or at someone else's party or at an outing where you have no control over who brings who, you can't just start drama because that would make everyone uncomfortable.
This, of course, is specific to when people are assholes. If someone's presence makes you angry you can always excuse yourself from the event. But if someone is harassing you, (touching inappropriately or without permission, stands too close, says inappropriate or lewd things etc.) you have the right to speak up about it and get angry. Those kinds of things can and should be vocalized, but if it's just that Sally so and so is annoying and a jerk, and you really don't like the way she eats cornflakes, that's something you don't need to voice aloud and can complain about at home.
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