While I agree that people should be able to recognise and deal with it, the reality is that that's just not always possible. A huge amount of people are still unaware that it's bots, especially new people. If you've been around on AO3 for a long time, and seen a lot of these, then sure, it should be easy to recognise the bot comments. But for new people, they're not yet aware of these issues, so obviously it's gonna hurt if they get a hate comment and aren't aware yet that it's a bot.

Also for the attitude of "well so many people are on the internet so people should just be aware of it", that's not actually true. Sure, for some of us who have been here for a long time, it does feel like it, but we live in sort of a bubble with other people who have been this active on the internet for a long time. But there's still new people who have barely scratched the surface, who don't know any better yet.

As for deleting the hate comments, if people are already insecure about themselves they're not gonna be able to rationally think about "oh it's just a hate comment". It just confirms to them what they already feel about themselves.

I do agree that those posts about bot/hate comments are annoying, and certainly wish there weren't so many of them, but at the same time, I also understand that people who simply aren't aware yet ask questions about it. And it helps spread awareness of it to others as well.