Maybe self protection, but I also don't think JS wants people to use him as source/tool to beat a stick at JKR. I felt that was he was objecting to the most. He clearly loves the films too.
Yes, that came across, Bunty. He had the chance to say 'I love the films, but...' like you're supposed to, and he didn't. It's a distraction and a trap and he didn't let himself get caught out.
He doesn't need to apologise for liking HP or wade into anything, just like Oswald didn't about being mates with Chappelle (but unfortunately chose to)