> Last but not least, try to base your arguments around points that your opponent didn't initially address

I may be misunderstanding this but the longer description didn't settle much in my mind. This is one of the worst things about online battles.

"A: GMOs are BAD!" "B: GMOs aren't bad. They are very helpful and most crops grown today are GMO in one way or another." "A: Nuh uh Monsanto blah"

I would call that an argument lost for A. The idiot just proved they have no supporting evidence for their initial statement except a different subject.