Personally I couldn’t care less, as I have never used the red X.
I don’t see any benefit to point out with a red X that one disagrees with another other than to start an argument, or to cause bad feelings.
Seems to me if someone wants to point out that they disagree they should reply and explain that they disagree and why.
We aren’t thinking that a red X is going to change another poster’s mind about what they posted are we?
It only serves to show other members a disagreement with no context as to why.