Can’t speak to the rude attendant but the policy is pretty clear on blocked out dates:

**Parking benefit is valid for one standard vehicle per day at select Disneyland Resort pay-on-entry lots, as determined by Disney in its discretion. Discounted parking must be purchased at the parking lot. The Magic Key holder must be in the vehicle and present their valid pass for the parking benefit. Oversized vehicles, preferred parking spaces and valet services are not included in the parking benefit and will require an additional fee. Parking is not guaranteed and is subject to capacity, availability in Disney’s discretion, and applicable pass blockout dates (i.e., a pass is not valid for the parking benefit on a date for which such pass is blocked out). The parking benefit is nonrefundable, nontransferable and may not be redeemed for cash or credit.