I am fine with the complaint he has. It is perfectly reasonable to want explanations on screen. But acting like "No that doesn't matter" when Disney was 100% clear that everything they do will be part of one canon story is what I have a problem with.
This is something that has existed in Star Wars since it's beginning however.
Why Luke can fly an X-wing? Well, the controls are like a T-16 skyhopper ... outside movie explanation.
How did Han get the Falcon from Landon? In a sabacc game ... it was merely stated to have been won.
How did Luke build a new lightsaber? He had Obi-wan's journal ... outside the movie explanation.