To clarify, my intent isn't to ban you. But you seem to be interested in figuring out what it will take.
There are a couple ways of answering your question:
1. Conduct yourself as you would in normal human interaction, at a school, a restaurant, a job, whatever. If you're annoying people or making things too personal, you'll be asked to leave. Maybe the waiters at a restaurant are terrible: if you stand on your table and start yelling about it, what do you think will happen? Remember, you can always leave the restaurant if you don't like the food (or service).
2. Many of your posts seem to be on (or over) the line of trolling, when someone interacts online only to cause problems. Please prove me wrong about that.
3. FlatAssembler might be entirely wrong. But it's not your job to harass someone if they're wrong. FlatAssembler has contributed genuine questions and ideas to the forum. You have not contributed anything yet aside from, well, skepticism, which by itself isn't a contribution at all. Everything in linguistics might be wrong. There, I said it, now you don't have to. And if that's how you feel, then you shouldn't be here. If you think there is something to be gained by still discussing these ideas, great.
Overall, whether someone is banned is, I suppose, a simple equation: are they contributing more than they are causing problems?
(You are correct that FlatAssembler's 'theories' post was also crossing a line, but one you've crossed repeatedly. My intention is not to ban or censor people here, and if you notice I asked FlatAssembler to not do that again. So at best your argument here could show that both of you should be banned, except that (1) FlatAssembler has been contributing other things that outweigh that small action, and (2) that was exaggerated, but what do you expect when you claim Latin was never a spoken language and otherwise only attack other theories? Did you really expect agreement?)
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In short, no one will be banned for expressing ideas. Someone might be banned for interacting in an unpleasant way.
Just common sense.
If you want to continue to interact here, then I suggest contributing. Ask or answer questions, and leave it at that.
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In short, for any reasonable sort of interaction here, you shouldn't even have to ask this question.