I assume you mean Pop Culture Happy Hour, one of many NPR (basically the US version of BBC Radio 4) podcasts ? The reason why they come from a (white) liberal standpoint is because of the three main presenters (who no doubt are socially liberal) one is a woman and the other a gay man and I’d say representation in pop culture matters to them personally. They also have guest reviewers on who almost always are people if colour who run other NPR programmes and podcasts, so even the “white” is not that correct.
If you wonder why that’s “their thing”, I’m not sure you’ve been on any US forums or social media which discusses film. The pushback against more diverse representation by white, male, heterosexual MAGA nutcases is overwhelming. It’s the biggest single issue in American culture now, because white, straight males see themselves as the most discriminated against group. Apparently political correctness oppresses them because it disapproves of their sexist, racist, homophobic antics and forces women and peope if colour at them as leads in superhero and Star Wars movies ! I don’t think that’s being painfully woke, that’s genuinely neccesary to adress that in America when it comes to discussing films now.
Not having a go at you but while Captain Marvel is getting middling review as a movie, the real story around it is that there are hate campaigns against it by a toxic fan community of trolls who are outraged because they don’t understand why we now need two female led superhero franchises (against dozens starring men). The whole Rotten Tomatoes ratings system just got changed because of trolls systematically driving down ratings and there are being death and rape threads issued....because of a fluffy superhero movie.
Apoerently The Eternals, one of MCUs upcoming movies, will feature the first gay superhero, so that will be something to behold when it comes to fan reactions.