I was taking the bus into town and I was listening in on conversations of various people. The key thing being talked about was how hardly done by they were. Someone 'was doing something' to them, or not 'doing' what they wanted. The bad traffic, the awful world events, the untruthful government...
How can this be happening? Why is it happening to me? ...and the blame ...and the judgement ...and the complaining.
We can be part of these dramas but they're all stories in the busyness of our minds. When you notice that your radar is repeatedly picking up on things, just observe without judgement. There's no need to solve why or where the complaining is coming from as that's just the mind (ego) solving for the mind (ego).
Take quiet time to observe the emotions around the thought. It may feel a little painful for a moment and you'll notice that they dissipate to leave space.