Well it’s not “just writing”, it’s a second, wholly distinct type of writing from our primary form of writing, and its use is usually reserved for writing personal letters, which is something nobody actually does anymore.
If “cursive” has no meaning to you because it’s “just how you write”, then you have your explanation for why Americans don’t like it. We’re taught to write in print for everything important. And that means that everything important that we read is also in print. So cursive is just an extraneous form of writing, that the reasons to use are shrinking by the day.
