I'm not sure it's ironic as much as it is either not paying attention or not being honest with the situation. One party being extreme does not make the other party the good party. It just means that one party is extreme, which is a fact. The Democrats are not a paragon of a political party. They are as inefficient, middle of the road moderate, corrupt, etc. as any political party. But the Republicans, or at least a powerful subset of them, have become an extremist group. And they are well-funded by conservative and libertarian ideologues who care about nothing other than power and money and can use their wealth to avoid any downsides in their quest.

Once you start looking into the ideologies of people like the Koch brothers, Robert Mercer and his family, Peter Thiel, Richard and Elizabeth Uihlein, Sheldon Adelson, Ronald Cameron, Steve Wynn, and others, you start seeing very weird and strange beliefs that are incompatible with a functional society. The primary thread is that these people do not care about others. Just look at the Koch brothers' political donations and the businesses they run. Is it then any surprise why the Republicans might not care so much about climate change and policies to mitigate it?

We have one extremist political party, and then the other, somewhat incompetent, party spends all their energy fighting back against the extremism of the other.