There are a lot of people in jobs where they're in no position to handle the complaints they get from customers. Yes, not just fans, these people are also customers! His job relies on their money. No matter how unjustified you think their "whining" might've been (and no, they were perfectly justified in calling out a scene in which a teenage girl was killed in a sexualized manner and for calling that the character got some degree of acknowledgement and respect afterward), when you are dealing with customers, you grin and bear it. If you can do nothing else, you refer it to someone who can.

This is basic customer service, and creator entitlement does not put on above it.