I'm very ugly, I'm very single. I don't expect anyone to do anything about it for me. You just have to get on with life and make the best of it. Be a nice person and try to enjoy yourself.
If the worst thing you have to deal with in life is having a sub-optimal face then you're probably pretty luck! Act like it.
As you say, there often isn't anything obviously actionable. It's just that in some cases, for some people, going from nothing actionable to dismissive can be a good way to convince them to find people who at least offer a hint of empathy.
Again, you're completely right. There's absolutely nothing anyone can do for them. Except, I think it might be the case that listening with sincerity might be an option.
Equality of outcome for all animals, but some animals are more equal than others.
What I find most interesting about this reaction is that it often comes from people who wholeheartedly believe in kindness, compassion, and empathy. In almost every other context.
Yet for these people, they're told that their feelings don't matter while everyone else's does. No wonder they sometimes react poorly. Perhaps if we want to avert their radicalization, we could consider the possibility of treating them with the same sensitivity we readily offer others when they express subjective pain and suffering.