The video would piss me right off. As far as I can tell, you did not consent to watching it, a video of him naked was sprung on you.

I think human bodies are fascinating and beautiful, and nakedness is not automatically a sexual thing (far, far from it, bodies are just bodies) but in this context (previous erotic tension between you, and no reason for you to see him without clothes, like he's not a life model for an art class you are attending, or whatnot) this just feels like blatant willy-waving. Like idiotic men who send cock shots on dating sites, he is getting off (not necessarily physically, but certainly psychosexually) on the idea of you seeing his 'proud masculine' form, without being too worried that you have not actually given clear consent.

He is prioritizing his amusement/enjoyment over consideration of your needs, and over respecting you as a human being who gets to decide whether to consent or not.