If you were expecting a defense of the title of this post (or the sub-title above), you are in for a let-down. It's not serious. It's a tongue-in-cheek facetious remark aimed at scolding Mr. Nick Norelli who (in this recent post) just doesn't get it.
Mr. Norelli makes the claim that "But apparently unless one has read White’s books, listened to his debates, or researched his teaching and/or ministry over the last 20 years then they can’t truly understand the context in which he says anything." This is just silly. Mr. Norelli goes on to quote the following paragraph from Dr. White:
2) Do not expect the Golden Rule to be applied to you if you are an evangelical. If you are going to address someone like Ehrman, you better do your homework. Read his works, listen to his lectures, study his articles. If you do not, you have nothing to say. However, anyone can comment on what you say as an evangelical without worrying about anything you have ever written or taught over twenty or more years. Just remember, the context of the evangelical is irrelevant; the context of the star-level scholar is all important. Also, it is fair to assume the evangelical believer is ignorant of anything you wish to attribute to them, even if you have no idea whether they are in fact ignorant of those subjects or not.(emphasis provided by Mr. Norelli)
For some reason, perhaps known only to God, Mr. Norelli has apparently mentally converted "not anything" into "not everything" and/or generalized his comment about people judging his scholarship into a comment about people understanding anything at all that he writes. This too is silly.
I'll put it in simple terms: "Don't say Dr. White doesn't know what he's talking about if you haven't done your homework on his background. And if you are going to say that Dr. White doesn't know what he's talking about, be prepared to back that up, because he'll call you on it."
More specifically, Dr. White has read most of what Ehrman has written, and his opinions of Ehrman's scholarship are consequently informed, even if one disagrees with them. In contrast, folks who bloviate based on a sentence or fragment thereof, taken in isolation, have an opinion that is uninformed.