Sikhs and the caste system

(sorry this is just a rant) I seriously dont get what is wrong with so many so called "Sikhs" caring about their own castes or discriminating others based on their caste. I see so many sardars especially who think that u have to be a Jatt to be respected like wth do you mean? One of th emain things we're taught is to not believe in the caste system and equality. I hear that there seperate gurdware for different castes like that is so messed up? What is wrong with people? These type of people ruin sikhi's image so much. Big Punjabi artists do this too. Diljit Dosanjh for one bcs he wears a pagg and is a Sikh but cant stop writing lyrics about Jatt Jatt Jatt.