In all seriousness he has half a point, but for the wrong reasons. Docker doesn't let you take your "old" languages and put them "in the cloud" over more superior approaches - it's a shipping container. That's it. It's a known quantity that lets you slot your 10,000,000 LOC Java monolith alongside your 25 line Python microservice and orchestrate them with the same tools.
That's the advantage. The side effect is, sure, you can take your old, shitty code and run it "in the cloud", and it's nothing "we should get rid of".
To put it another way: "Shipping containers protects a transportation method that we should get rid of". Sure, drones could fly every item individually to you from the factory, but while you're fiddling around with that Maersk is shipping 20% of the worlds GDP every year by dealing with what it knows best: how to move containers, not caring about what's in them.