It might be my own idiosyncrasies coming through (non-native speaker + how we use the term among friends to point out stupid stuff)

"Meanwhile" means there isn't any particular connection, but replying in disagreement is very common and on social media it's often assumed if ambiguous.

This seems to happen all the time. Someone is just trying to make conversation (like me, here) and people try really hard to see in what way they were attacked by the comment.

To be fair, I almost always reply in at least mild disagreement, though I try to be friendly about it. I’m doing that now.

If I agree, I upvote and move on.

Can I just point out that my comment wasn't an outright contradiction either, people just assumed it must have been one (correctly, in this case) since it would have been a rather pointless observation otherwise.