I agree up to a certain extent. People tend to analyze certain character quotes and either misinterpret them or exaggerate them.Semi-related to this thread, something I hate much more than canon-snobs is people who disregard what was said in the manga. Things like Itachi saying the best he could do vs Jiraiya is a tie is simply disregarded. And on that same topic, people say Kisame could take on Jiraiya despite the fact that Kisame stated Jiraiya is on a completely different level.
They'll use the manga when it backs up their facts, but when the manga states a fact that defeats their argument, they make up an excuse for why it was said.
Like the famous: "HO HO HO, You were called the Professor for knowing every jutsu in the Leaf" or something like that..