There's a modern trend (though perhaps it has always been there) of people deciding they're Very Cross (TM) about issue X, Y or Z and will never, ever stop talking about it.
It then becomes part of their identity, to the degree that it becomes impossible for them to accept nuance, or that perhaps they can propose no alternative to the thing that makes them cross, let alone to consider that they may be in part or wholly wrong about it.
And then these people rinse and repeat over and over and over again...
You see it for big issues, small issues, niche issues, broad issues.
Humility and willingness to be embarrassed are how you escape from this trap, but both of those are in very short supply, and self righteousness is a hell of a drug.