You know what is interesting? Everyone agrees that interrupting someone is a rude thing to do. There also seems to be a general consensus that, by and large, people are rude on the Internet. However, it is impossible to interrupt someone on the Internet.
Think about it. You can only comment or reply to something once you have seen all of it. You can't take over a Reddit comment mid-post and tell the poster why you think they're wrong. You have to wait until the end to do that. It's a small thing, sure, but something that we should all be grateful for.
That being said, it seems like Twitter users are trying to change that. They seem pretty far off but, even so, let's still appreciate what we have while we still have it.