There isn't a lot of context for what is happening, but the video is basically divided into three parts.
In the first, there is an announcement over the speakers that everyone must deboard, basically because two women wearing Trump gear with their masks around their necks are refusing to put them on.
In the second part, as people are exiting, one of the women repeatedly says "have a good day, n---a" to Black passengers as they exit past her.
And in the third part, both women are being led away with their baggage by officers, as the crowd claps.
While there isn't much explanation for how things got so extreme, it's pretty easy to guess that these two anti-mask racist Trump supporters refused to wear their masks on board the plane as is current airline policy, and were too stupid to realize the plane hadn't taken off yet.
Naturally, the video has filled people with a lot of disgust and frustration that these types of people are still spreading both hate and germs over everybody:
Usually, when people are caught behaving badly, their identities are exposed eventually by the Internet's sleuths. So far, these women have not been named and shamed. Based on their behavior, it doesn't seem like they're actually capable of the latter.