A colleague whose behavior is consistently demeaning, belittling, or draining, but never crosses into a single clear incident, is a real and measurable problem, not oversensitivity. Research on exactly this pattern found something specific that matters before you respond. The instinct to confront it directly is usually the wrong move.
A real cost, even without a clean incident
Research by Robert Sutton, a Stanford professor, names and quantifies a category that sits between ordinary difficult colleague and something that meets a formal harassment threshold. A genuinely corrosive presence carries a real organizational cost, in turnover, in health impact, in team performance, even when no single moment would hold up as a formal complaint on its own. Naming that cost as real is worth doing plainly, since the lack of one clean incident often gets used, including by the person experiencing it, to talk themselves out of taking it seriously.
Why direct confrontation tends to backfire
The instinct to address this kind of pattern head on, naming it plainly to the person, usually feels like the mature, direct option. Sutton's own research found this specific pattern often responds to direct confrontation by escalating, not resolving, since the behavior is typically not receptive to being called out by a peer in the first place. This is a case where the direct approach, generally sound advice for most workplace friction, is not the right fit for this specific type of person.
What actually helps instead
The more effective response is exposure management rather than confrontation or an attempt to change the person. Reducing unnecessary contact where you have any control over it. Protecting decisions and work you care about from that person's influence, structurally, rather than through argument. Building visible support and allies around the situation, so you are not carrying it entirely alone.
None of this is about avoidance for its own sake. It is a deliberate response to a pattern the research suggests does not respond well to a more direct one.
Where the line sits
This sits below a formal harassment or discrimination threshold, a protected characteristic involved, or a single incident serious enough to warrant a formal process. If what you are dealing with clearly crosses that line, this is not the right framework, and it is worth treating as the more serious situation it actually is.
Where to start
Name, specifically and honestly to yourself, what pattern you are actually dealing with, ongoing corrosiveness without a clean incident, or something that crosses further. If it is the former, pick one piece of unnecessary contact you can reduce this week, a meeting you do not need to be in, a channel you can mute, a decision you can route around them.
Do it quietly, without announcing it as a response to them specifically.
Reading exactly where a given situation sits, ordinary friction, this corrosive pattern, or something more serious, is a judgment only you can make from inside it, since the details matter more than any general description can capture. What this gives you is a response that fits once you have made that call.
There is a specific way to build the kind of quiet support around a situation like this so it does not read as complaining, and it is worth setting up before you need to lean on it.