Of course you shouldn't claim "the following is only my opinion" for all your posts, or for an explanation you read on the Internet that you think was the result of some scholarly study. If you did you would need to precede it with a meta-disclaimer: "the following disclaimer is a routine disclaimer I put on my post without regard to whether it is accurate".

I have seen some people who put routine disclaimers on their posts without regard to whether it was needed, and it was annoying (definitely to me, but also, I believe without proof, to a lot of others).

Something like "I read this explanation somewhere, which makes much more sense than the usual one" seems appropriate.