First of all: I have removed the quoted text from the answer as it was unnecessarily aggressive and not in line with our Code of Conduct. Feel free to flag any similar kind of language for moderator attention and we'll deal with it.
Onto the more general question: there is no specific policy per se on rules questions, but the general Stack Exchange guidance applies in that the best answers are supported by evidence, and the community will tend to vote this way. For a lot of rules questions, this can be a quote from the official rules or guidance of whatever game it is; see for example this excellent and highly voted answer which includes definitive quotes to support the assertions made. Now compare with this answer to the same question which may also be right, but has been downvoted by the community, almost certainly due to the lack of evidence.
This isn't to say that every rules question must have a quote from an official source for the community to consider it a good answer, but if an answer is making an assertion of fact (as opposed to judgement) and doesn't provide evidence to support that assertion, it's pretty likely the community will vote it down, and that's what happened to the original short version of the answer (scroll to the bottom). The revised answer is a better answer as it now includes references to the rules, and the logic which is applied to those rules to get to the conclusion asserted; however, the combination of the early version of the answer and the tone may well mean that the answer languishes in negative territory.