Difficult Colleague

[Whoknows89]

I have been in my role for 6 months and I am close to all my team bar one person.
This person isn’t really a team player . The rest of us help each other out , but she will ignore messages/ not help out . They will take work/ cases off other people to increase their case load. Sometimes this is very inappropriate . She is also quite rude and doesn’t say hello .She intervenes with other colleagues work and then have a go at them about it .
Anyway I am close with another colleague and thought we were friends but he sticks up for this other person relentlessly and says she has had a hard upbringing and this is why she is the way she is .

Am I being unreasonable to avoid them both ( in particular this work friend ).

It depends what you mean you mean by avoid. You don’t have to socialise with your colleagues, but if you mean avoid in the workplace then that sounds unprofessional.

You have only been there six months, let the line manager deal with any issues with the other employee.

I don't think you are being reasonable to expect a work colleague to be exclusively loyal to you, it's not school - get on with your work and stop being so divisive.

Just be professional even if others aren’t