My campaing is not a video game

Help Guys my campaing is treated like a video game. Every encounter my party makes is just about who gets the most exp. Who loots first and who kills the most people. Everything is ooc and my party does not like role playing at all as they think its kinda cringe but still try it. Also killing a dragon then reviving it and then seducing it is really one exemple of how Frustrating this is. And then they are mad at me if i say no because i am "abusing my dm power" only because i want a serious campaign. But my group are just like the baddest of bad guys i know. They don't care about annyone or annything especially if their backstory is sad. Villains get laughed at because my voice is not that deep and i'm female who tries to play a male villain. Also beeing evil isn't wrong. But it is when your party consist of people who are regarded as heroes in their backstory 😭

Ps: Guys i know you want to help me but i know what a session 0 is and i had one before the campaign startet

Psps: I think some of you missread it. The dragon thing did not happen. They wantet to do it but i did not let them. They then said i am abusing dm powers and were pisses at me for the next sessions