Toxic Team Members - What to do?
Be a leader and talk to them. be friendly but explain that their actions are detrimental to the performance of the team. Ask why there are issues and try to address them. Look for all options to solve the issues but, bottom line, take them out if there's no other option.
Sometimes leadership requires hard measures.
Negotiate or persuade the person in a way that they can understand (i. e. direct or subtle approach). Sell them on thinking and behaving in a way that is conducive to reaching team goals. Give the person a chance to align themselves with the team. Provide a time frame for this change to take place. After the allotted time has passed, reevaluate whether the person is a help or hinderance. If one person continues to be detrimental, to the whole, perhaps they would do better elsewhere.
First you have to have some authority. If you dont and its a peer dont be afraid to state the problem clearly with no personal references. Keep it objective. Even better ask a question hat compels the person to answer or avoid. THat way youll bring attention to the problem.
These conversations are uncomfortable but incredibly powerful for the overall team. If a toxic team member remains in that state for too long, then the culture of your local team is impacted.
I have approached these conversations with clear examples to provide context that demonstrated the actual outcome. "When you did/do this (example)..... the person/team felt, observed or heard this (actual impact)" Sometimes people don't realize the impact of their actions or words. I have found this to be especially true of very technical people. At any rate, having real examples is incredibly helpful.
Hopefully the person will listen and take a pause or act differently. If not, then it becomes a performance conversation as opposed to a coaching conversation. Document everything.