Just saying, the phrase "Just saying" is such an awful, awful phrase.
It means absolutely nothing. It is often used, idiotically, to punctuate a point when it makes the point weaker. If you actually examine it, it's a way to sort of weakly distance yourself from your point. It is such a useless phrase. It is not even a complete thought, and it reads like the way a 14 year old girl ends a snarky text about another girl from school.
I imagine the OP has just seen other people use it on message boards and finds it acceptable. It is not. It is extremely stupid. I won't even address the complete void of content that is the thread itself.
Yes, I'm on an absolute "Just saying" jihad.