From First World Problems:
The dismissed person feels judged, but the dismissive one also needs to take a long, hard look at themselves. It’s a dangerous thing to appoint yourself as the judge of another person’s problems, and whether they really ‘count’ or not.
That’s the kind of thinking that caused mental health care to be marginalised for so many decades: the idea that it could be a lot worse, so by extension you should just pull yourself together and get on with it. It’s a systemic failure of empathy.
Now, that’s taking it to extremes, most definitely. There’s a gulf of experience between mental health problems and forgetting your iPhone charger. But it’s such a corrosive attitude to casually disregard and disdain whatever someone else is complaining about. There’s a thread of sociopathy to it.