Is it OK to gentle correct someone for disseminating inaccurate information over the internet?
Absolutely. As I've said before there's a difference between a message and the veracity of the speaker of the message, or context, or whatever. If I were spreading something that had an inaccuracy in it, I would hope someone would let me know before I continued to spread it. The message can still be conveyed but in a more accurate way going forward. The "gentle" is the key though, but really that's not hard to do.
Does it make me a weenie if I don't correct someone because their wildly inaccurate misconception of something actually amuses the hell out of me?