I guess the reason is that by reporting the rules (which is quite retarded in the first place, everyone would agree on that), you are ABUSING A FORUM FEATURE and wasting the moderators time, hence the warning.
If you have a question about it i suggest you ask the person who gave you this warning. (is it anonymous?)
If you have a question about it i suggest you ask the person who gave you this warning. (is it anonymous?)