Accelerator already touched on the side dish/main dish concept being not really a thing for the most part. That being said it is important to note, that traditionally fried rice is basically a leftovers only dish. Like you wouldn’t cook fried rice to cook fried rice. You’d cook fried rice because you had leftover steamed rice from the other night (and you’d use other leftover ingredients too). So, I suppose in a lot of those instances you’d only be eating fried rice, thus making it a main course by technicality (though it doesn’t have to be).
Source: Am part Chinese. Would cook fried rice to cook fried rice and disgrace my ancestors.