Would you care to summarize their argument?

Self-driving cars still take up space on the road. Even more than human-driven cars, because now there will also be cars transporting 0 people. It's going to make congestion worse. Public transit is the solution to congestion. Well, one of the solutions, because bikes are probably a better solution for most people: they do start in front of your home, can park anywhere, and don't cause congestion the way cars do.

We're talking about cities, of course; in rural areas, nothing beats cars.