I am quite a straightforward person so in my personal life if I didn't like a person I wouldn't associate them, and if I am your friend I am your friend - no drama in my relationships.
At work obviously you can't not associate with someone you don't like. I get on with most people in life really and my natural default is being v friendly. I would be polite and professional with someone I don't like but wouldn't go out of my way to be friendly. There are also not many people I don't like in life, it is only nasty types I dislike.
There is a woman at work who has show herself to be quite devious. Talks behind people's backs to managers without discussing the (usually very minor) issue with people first, deflects blame, causes issues where there are none. Because of things she had done and instinct, I just know she doesn't like me. (don't want to give details as to be too outing)
She has done the above to me so I am quite wary. But always nice as pie to my face. The other day I asked her do something and I copied in my manager so my manager has visibility of what is going on as it would be typical of this colleague further down the line to say "i hadn't been asked to do this / wasn't aware."
Colleague called me shortly after and was sucking up to me and was proper up my arse? As someone who is honest I really have trouble understanding this behaviour. I don't even get why she was sucking up to me? Because i showed a bit of assertiveness due to copying my manager? Because she knows I am onto her?
People like this truly baffle me. Insights welcome of how to deal with such people or similar stories.