Yea, the American south will be hit and sucks to be them, but like I said the majority lives on the Midwest-East Coast band which isn't affected
as much. For the majority population there, temperatures will warm up but because it was relatively cool there to begin with it'll still end up with a livable temperature.
Ultimately it's a comparative:
- India's going to have the entire country affected with basic stuff like food yields and rainfall decreasing while outdoor temperatures rise. In particular, outdoor temperatures are expected to regularly reach the point where human bodies shut down. That means even if they live, they're not going to be getting much of any work done. Not without copious amounts of A/C at least.
- Europe's going to get much colder as the AMOC shuts down, making Europe actually feel like its northern latitude. That means temperatures like Canada (north of Ottawa) rather than relative warmth it has now.
- Sahara might actually get wetter due to increased condensation, but this also means less fertilizing dust is blown to the Amazon. That means the Amazon starts to die off and because the Amazon generates its own rain, less rain in South America as the rainforest shrinks. The exposed land is also going to be less fertile. While Sahara gets wetter, it's still not likely to get wet enough to support significant human activity. So North Africa is less pleasant and sub-Saharan Africa will be hotter but still livable.
- Southern China (Guangdong and the like) will likely have lower river flows. That will put pressure on freshwater consumption and hydroelectric generation. Temperatures will rise and be unpleasant but still livable. The upside is Dongbei might become more pleasant climate-wise and thus help offset the rust belt there.
- Southern/western US is going to suffer droughts and high temperatures. At least unlike India, they will still be livable temperatures, just unpleasant. The stopping of the AMOC will also correspond to a weakening of the Polar Vortex which means these southern states might get hit with colder temperatures than they are used to - like the Texan Winter you mentioned. But the saving grace here is that the majority of the US population lives in the Midwest-East Coast band which is already (1) used to winter temperatures from the Polar Vortex (2) almost cold like Dongbei so any warming is actually good rather than bad
- Russia will gain more usable land as the permafrost retreats. As the country suffers from low temperatures like Dongbei, any warming is actually good for human activity. Similarly, warming opens up the Arctic route from a meme to something feasible for regular activity.
So the warming climate benefits Russia, is on balance neutral for US & China, and sucks for everyone else.
But I think I've dragged this sufficiently off topic and should be in the Climate Change thread. I'll end my side here.