We're all on this rock together, and either nobody's pain is worthy or everyone's is.
This overgeneralizes IMHO. While the pain of being laid off due to something other than your own actions is fine, there are certainly folks out there who cause a lot of pain to others and aren't worthy of universal sympathy when their own pain comes along.
Everyone thinks that when they're angry or upset with someone. Ultimately people are people, and everyone deserves sympathy when bad things happen to them. Note that i don't always accomplish this, but I certainly think it's worth trying.
It is not true that all rational people believe that all people deserve sympathy for all causes of suffering.
As soon as you find me one of these unicorns, I'll concede the point.
Like, ultimately you don't have to show compassion for other humans, but in general, life will be better for all of us if we all do.