I don't show you that I care would probably be more accurate.

Always a helpful and productive approach to solving interpersonal problems.

Me caring doesn’t need to be a problem for others. Should we all shout about our minor preferences and gripes all the time?

There are people like that, and they are exhausting. It’s essentially a selfish use of a communal good, which is the shared environment.

There’s a limit to silent annoyance, of course. But my officemate noisily ate a smelly egg breakfast every day and I just bided my time until I could move.

Not OP but my general approach is similar: "I see it as wrong but do not feel entitled to impose my standards on others".

Perhaps he's a German expat who has absorbed the Parisian attitude

Watch me not care