"Harry Potter" alum Jason Isaacs weighed in on the online controversy surrounding Paapa Essiedu's casting in the upcoming HBO series adaptation.

Jason Isaacs called out the "racist" Harry Potter fans who have gone out of their way to be "rude" to Severus Snape actor Paapa Essiedu.

On the whole, the cast that’s been put together for the new Harry Potter series looks rock solid. For his part, Jason Isaacs seems to be looking forward to the show. He thinks any naysayers will have to eat their words once they see what the cast, including Paapa Essiedu, are capable of. Isaacs continued…