No one likes to receive something negative, and when we also have anonymity in all of this, then surely that negativity increases even more because we don't actually know who is the one who expresses such negativity towards us. However, it is definitely better that the karma points are anonymous, because otherwise there would be revenge, and that was even worse.
I don't have any notification bot, so I don't know if I got negative karma, but I wouldn't be surprised if I did - those members who have a bad opinion about me on the BTT forum certainly have it here too. We need to learn to live with the fact that we are not loved by everyone, regardless of the content of our posts.