The Shining is essentially a film about America & Americana so to speak. The film deals with racism, sexism, classism, & the American family. We see the racist aspects of the film from how the cook is referred too, the building of the hotel on top of an Indian burial ground, & the blatant disrespect of Indian art the way Jack was throwing the ball against it. We see sexism in Jack being upset that Wendy won't let him discipline Danny the way he wants to & his disrespect for her. Classism is depicted with the tour guide's happiness at the Overlook hotel being built on an Indian burial ground and the fighting off of Indians as if it were worth it. In the long run, the atrocity was alright because look at what we built. The American family is touched on in several manners but you see the breaking down of it through Wendy not agreeing with Jack's parenting methods and the ultimate fighting away Danny & herself from Jack.
All of this shows that Jack is your quintessential white man. With everything geared towards him due to the systems in place, once change starts happening that question his authority or flat out take away his power, you see the violent backlash. Jack was calm in the beginning even if rude to his family, but when they start breaking away from him, and then a black man is coming to save them, you see the true nature of Jack, one that has always been there (the ending with the party photo), and will be there (everything that happen during the movie), and will go on in the future too.
You can find a deeper analysis here:
Stanley Kubrick’s ‘The Shining’: American Deterioration Through Americana | The Artifice