I am wading in here because I have actually watched the majority of Bern's videos. I think she is brave, and I am a fan. Magdalen has been calling out bullsh*t on YouTube for ages, and tends to make response videos to things that are either directly or indirectly related to her. I would hate to have her Twitter feed, especially when she started this.
I don't agree with Bern's style all the time, or everything she says, but I will acknowledge that her very presence on YouTube has been a comfort. She explains her position well and frequently makes me laugh. She's not there as a neutral commentator, she doesn't speak as a political representative of any specific group. She is freely speaking her mind in a medium where the culture is that everyone bashes each other all the time. Not even Laci Green, that most innocuous and inclusive of feminists, was safe from being flamed. Why wouldn't it be okay for Magdalen to use humour to get her points across?
The video in discussion is a response to Meyer's video that essentially mocks another trans woman (Muscato). I fail to see how the take-away message is that Magdalen is at fault because she is mocking the idea of Meyer making fun of Muscato in order to make a point about the hypocrisy of the whole thing?
I think Berns did the South African accent because she is making a point about identities and who can opt-in to them. It is similar to the idea referenced when other people draw parallels between trans ideology and trans-racialism. Perhaps the song at the end was a "cheap shot", but I don't think it was racially motivated: they are both white and Berns strikes me as someone who thinks about history/politics when it comes to her opinions of countries as a whole. I saw it more as a reference to South Africa's apartheid past. You might as well call her horrendously xenophobic for her anti-American views, given her videos on the topic.
If we say others (including Blaire White, who doesn't exactly mince her words and has a video called "triggering tr*nnies pt 2" wherein she rips into several trans activists looks) can satirize and use humour to talk about difficult subjects, then women (even gender critical ones) should be allowed to do the same. Berns makes fun of almost everyone. Show me where Magdalen is calling for violence against people or calling individuals subhuman, and I will change my mind on her.
A gentle ribbing to me actually makes me feel like she is treating people like equals, instead of wrapping them in cotton wool.
I think Magdalen is exposed to other views ALL the time, given that she makes so many response videos and has tackled anti-feminists/MGTOWs/MRAs/etc. And she has shown that she is willing to defend those that she has previously made fun of (Arielle Scarcella and Jaclyn Glenn come to mind).