What to do when a coworker constantly undermines you?

Go to HR if you have evidence of sabotage. Or try 3 steps:

1. What NOT to do: retaliate, demand an apology, ask why they did it – these tend to escalate and you might even fall prey to gaslighting.
2. Meet with the offender and describe what factually happened: credit not given, deadline not met, information withheld. State plainly WHAT YOU WANT CHANGED – that’s the outcome you want.
3. Quantify how the undermining has affected your work performance/belongingness: lost productivity, trust deficit, workplace discomfort. Along with the what/when/where/witness of the undermining, they form “the evidence” for HR if the offender doesn’t stop.

On the other hand, 🤔: Do I really want to expend my limited energy on the saboteur or my limitless destiny? 

Also see:

What to do when your boss constantly undermines your work?

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