In short – mostly, it is disgusting.
Why am I saying that ? Well, the way I see it, reality tv is focused on showing us human drama, when non-actors are edited to be presented at time of suffering, breaking and, sometimes, triumph. I.e. something that news reporter would do describing real events. But reality tv events are made up just to elicit strong emotions. There is a difference between sport event playing out in real time and reality tv when people get humiliated on camera for money. People who, unlike actors in soap opera, will go home and stay being themselves. Same, they’ve been captured for our entrainment and for endless future embarrassment.
I understand that there is a spectrum, and not on every reality tv people get screamed at by pro chefs bullies and cry in public. And some shows are really about battle of skills and not the editors. But generally speaking, reality tv is disgusting,