Sorry to hear about the bad experience with a 'spoiled' aka 'rotten' mango. Even an 'appus' may get rotten in various circumstances. Unseasonal rain can cause fungal disease. Wounding or bruising while picking, picking immature fruit, storage in less than 21 degrees C, the way they are stored or stacked with heavy pressure on them and so on and on. You did the wise thing like I would have done by discarding it. Recommend to try another Cushman from a different store. If properly harvested, handled, stored and ripened you may somewhat change your opinion on the ' Cushmans'. Good luck.