And it doesn't make almost any difference, because other countries are building hume amounts of coal plants. China started 95GW of coal plant construction just last year.
They're adding coal capacity quickly, but they're lowering the capacity factor of that usage even faster. Those coal plants are peakers that only run when solar & batteries are empty.
It was up 1.5% for 2024 compared to 2023: https://www.reuters.com/business/energy/chinas-thermal-power...
[1]: https://www.statista.com/statistics/265491/chinese-coal-cons...
Increasingly cheap battery storage, also built in China, is also being deployed rapidly.
It all makes a lot of difference.
[0] https://www.pv-magazine.com/2024/02/02/chinas-new-pv-install...
Western transition away from fossil fuel usage is still a reduction in net fossil fuel usage when compared to no shift at all. In other words fossil fuel usage might still be growing, but it is growing at a slower rate. If we accept that fossil fuel usage should be minmized then it very much matters.
Aside from that; this argument reduces to an exceptionally bad moral stance which is: Someone else is doing bad things, therefore that justifies me doing that bad thing. Or as you might phrase the counter-argument to a young child: just because someone else is littering doesn't mean that it is ok for you to litter.