You specifically called out security vulnerabilities, but the point missed by the commenter you are replying to is that people who ridicule something originating from DHH or AI are generally not based on nothing. "People just hate X no matter what" is almost always a low-quality complaint, for most values of X.
That remains to be seen. The whole concept is still in its infancy. An AI reviewer should have caught these issues when they were PRs.
But you see, it wasn't even a PR. It was just DHH making a straight up commit on the main branch (as far as I can see). With a message "Do all the additional Docker configuration needed". Was it even AI-assisted? At least the commit message wasn't, AIs write smarter commit messages than that.
I said on my earlier comment that DHH and AI get ridiculed automatically because people hate both. That doesn't mean that the ridicule isn't always justified.
Which tells me that they don't really take security seriously because everyone knows exposing the docker socket is dangerous. I would almost bet that AI would warn about that.