So, it's meta-debate day today?
I have seen what you are describing here and elsewhere used in debates, in valid and in disingenuous forms.
I have used some of them, e.g. the rhetorical question for evidence (when I know there is none).
The fact that some of the rhetorical devices (and even some of the "fallacies") have valid uses, makes it so difficult to detect them and defend against, when they are used for trolling.
To your main question, requiring expertise to participate in a debate, it is reasonable, but rude and probably against the site rules. At least RF is open to the public. You won't invite a layman to speak at a science conference, but here you have to deal with the hoi polloi.
It's a bit like your preschooler stating their opinion about politics at your dinner table. Or like the teen at your friends - now you vary. Do they know what they are talking about?
I think you hit upon a good point in that the forum or venue where a debate or discussion occurs can be a factor in how people conduct themselves. There have also been times when I might look at a discussion where people are arguing about something, and it might seem like an intellectual debate on a surface level, but I can sense some sort of subtle, underlying political position held by one or more participants.
A classic example might be evolution vs. creationism. Are people really, truly just having an intellectual debate about the science of evolution? Or is there something else behind the scenes, perhaps some kind of political position being addressed?
Some people can get rather passionate and even angry, yet when pressed, they'll claim that they have no personal feelings on the matter and that they're just doing it for "fun" or some kind of meaningless intellectual exercise.