1) Which aveiros do the MO make into a mitzvah?
2) If it’s assur to walk into a pub (as you mentioned based on the YU Commentator ad), why is it a mitzvah for Charedim to go to a pub on a date? (Or is that an aveirah that the Charedi make into a mitzvah?)
3) Which great rabbi called out R’ Kook? Keep in mind that in the olden days, criticizing one opinion of a rabbi was not calling him an evil rasha. In those days people were still allowed to criticize an opinion while still respecting the person.
4) Why should I ask them or their rabbi why they don’t eat in a sukkah? The Shulchan Aruch paskens that you have to. The Rema paskens you have to. (That is certainly more than the Rema discusses elbows and necklines.)