That is very nice, gavra but when you are discussing learning outside the bais medrash with a large unknown audience you must be careful what you write. Also maybe you look at it as a chance to talk in learning but when ‘someone’ writes ” could not find anywhere in halacha where it says…” than they are not looking to talk in learning. Especially if someone than gives them quite a few mekoros in halacha and they still do not change their view.
And it is not merely talking in learning if you are trying to force something to be a derabanan. The attitude was almost like if it is assur midrabanan it is basically muttar. That is not called talking in learning. And it is not talking in learning if you have a conclusion that it is a derabanan without understanding the basics of hilchos shabbos