I think they meant the person you were responding to never claimed that the person they were responding to said that we should tolerate self driving systems that are no better than the worse of us, not that the person that the person you were responding to was responding to never said the thing you very clearly directly quoted.
I think you might have misunderstood someone here. The person you quoted made a generic statement about what we should expect from an autonomous vehicle, but never said (nor implied imho) that the person he responds to didn't expect the same.