Looking at intra-state policies shows a malice & cruelty within Red states, to defund & desupport public institutions. Texas ending professorial tenure there-by effectively ending the state's public colleges viability, the bitter long resistance to Obamacare & public pools, poor support for public transit, hostile & useless unemployment insurance programs; I dunno it just seems like the states that are red have extremist anti-human policies.
That doesn't affect your statement that the national level has seen outflows from red states. I don't know of any evidence that that is the case. I think it's somewhat common & known knowledge that red states tend to receive radically disproportionate shares of federal funding in general. Some of this is just logistics, that red states are less populated generally, and require more support to maintain services like roads, power, etc cetera.
I think a lot of people want everyone in America to succeed. A lot of people want inclusive America, that succeeds & tries & works together to better the economic, spiritual, & libertous nature of our nation. I don't think the zero sum view represents both sides at all. Progressive agenda is not to take. It's to help those in need. But that hand keeps being snipped at & chewed on, by the red states needing the most assistance often. States unwilling to try to govern.