This episode is my favourite so far because:
1. Big Mac actually speaks more than he ever did in the previous seasons, even if it was disguised as Orchard Blossom.
2. It built upon his character, and shows how family oriented he is, going so far as to enter a competition to earn the love of his little sister.
3. The way the two reconcile at the end.
and 4. The fact the officials said plain as day why he was disqualified (is evident there was no drag, trans, or whatever buzzword the SJW horde use to claim offence to).
If you want to blame “shitty writing”, why the hell have a “sisterhooves” event with a vague ruling, when it could be a more open and friendly family-social, which is more inclusive, and could allow Big Mac to take Apple Jack’s place? Just saying.