Seems to me that disagreeing with and arguing against, a post is exactly why we are here. It isn’t to all sit around saying “yes I agree with everything you say” is it?
Is disagreement the same as ridicule? No, I think not.
And arguing against a point of view is not the same as insulting/demeaning/ridiculing the poster.
If anyone feels the line has been crossed they should IMHO point it out at the time.
Doubtless some will have differing attitudes about where the line is drawn.
As for the comment that “I always think I’m right”?
I do post things I think to be correct. I do not post things I believe to be wrong.
But, isn’t that the same for everyone?