A stupid argument

Person A says something will be carbon neutral or even positive. Pearson B will claim the manufacturing process of the carbon neutral device means it is actually creating more carbon.

There are few carbon credits in producing a product. However in the case I am thinking about its just nonsense. 

A yacht maker said that with the 1 kilowatt array built into the boat the ship would be carbon neutral at port. The idiot claimed that the manufacturing process for solar cells would make it a carbon threat. They promoted the idea that running a diesel engine to make electricity was actually more better than solar cells from the standpoint of being net zero.

Dude lets look at the carbon debt of a diesel engine part by part, then compare that to a solar cell. Furthermore a solar cell when finished does not burn any carbon, but a diesel engine is created to do just that. Plus oil changes, filters
belts, glow plugs forever.