The issue, I think (and all of Mr. BF's older, white, conservative, male, LNP voting rellies agree with this), is that there is no valid argument for the No! side. So any and all No! arguments, even from otherwise level-headed and well-reasoned people, are gonna be specious.*
FWIW, all these in-law rellies with whom I get into shouty arguments most weeks (a couple are pro-Trump! They believe the Adani mine will be great for jobs and not at all problematic for the environment! They use the term "PC" in that pejorative way that means they don't actually know what it means!) ... every single last one of them cannot understand what the problem is with having SSM and will be "voting" yes.
*Basically, it's impossible for a well-reasoned argument in favour of No! because no such argument exists.