I don't think your wrong. Someone being that entitled and ignorant must be the rare exception in 2017. Maybe I'm in a bubble too.

The conversation usually goes like this with my folk:

I get it, Moby is the OSS version and can be easily stood up and you don't see the need for extra cost. I'm glad you're trying to reduce expenses, but I don't mind paying for 24x7 Enterprise Support and it gives me piece of mind and priority escalation support.

Basically, I don't mind paying extra for a get out of jail free card if a whole swarm is offline.... I can tell the CEO we have the vendor partner engaged with a critical ticket and she can have piece of mind too. So, let's quote out the Enterprise version of Docker and evaluate the TCO of both solutions.