While I understand your sentiment, Blade, keep in mind that this is the internet, and you see neither the guest's expression nor his gesture.
D's request was to discuss the matter at hand, and the guest has stated that he doesn't see it as an important feature.
The guest may suck at expressing his opinion unambiguously, but imo, there's not enough message there to conclude he was being arrogant - you can say "I don't think this is important - nobody cares for the movie list" absolutely without focusing on your own needs.
And, ultimately...how many mods
do you know that come with custom movies? I see that you're the requester of that feature, so I assume you, personally, need it. But how many others do you know who do?
I'm not saying it shouldn't be implemented, even if you're the only one who needs it - I'm just saying, this is a feature that would only be useful for a very select group of modders, who not only make a full single player campaign in the first place (which is sort of rare), but also want movies to unlock in the process
and don't like/can't use the original file names.
As such, while it is dangerous to say "only a very few people are intrested in movie list" without surveys or statistics, you will have to admit that, for modders in general, this feature will be much less interesting than, say
having multiple turrets on a unit.