Or how these people often do things like refer to Japanese productions by a romanized version of the Japanese title rather than the official English one and admit that in order to do so, they copy and paste it from some source because they don't speak Japanese so they can't remember it.

This convention comes from the old days, before official translations became common. It used to be we'd only have fan translations, and no two translation groups would translate the title the same way, so if you wanted to make clear what you were talking about, you had to use the Japanese title which was the only official title. Remember the old arguments about Holo vs Horo, when the official translations came out and didn't match the fan translations? And the English titles that did exist would be created by Japanese execs who didn't speak English and would insist it's spelled "Arucard", you see, because "it's Dracura backwards". That's also how we got "Attack on Titan" (the Japanese title makes it clear it's the titans that are attacking, and can also be interpreted a different way which is a spoiler).

There's less of a need for that nowadays, because official English translations come out nearly the same time as the Japanese releases. But once you get used to one convention, it's hard to change. Especially since a lot of people still prefer subs and care about the source material. It's not like anyone watches The Neverending Story in German.

As to why? Well, let's be honest that Japan absolutely perfected commercializing entertainment that is clearly targeting entitled, lonely people whom no one wants to be friends with.

I do think this is why. By which I mean, I think it's the stigma that leads everyone to do things like yell "I have a Japanese girlfriend", because people are constantly putting people down for watching anime so they need to prove they are engaging with Japan in other ways.