Actually, Harry and Neville have two different birthdays. Neville was born on July 30 and Harry was born on July They both were born at the end of July. Which is why Neville could've been The Chosen One. But it's still a funny joke!
At this point, I don't know what's worse, a person who's full of envy and mental issues spreading rumors & lies. Or the people with not enough education or common sense who believe them. Yep, it's a toss up!