I suspect the maintainer never properly realized how much Co-authorship or authorship of the patch meant to the contributor (given that this was their first contribution), and that was probably informed by the size of the patch, the fact that the OP used their corporate email address and the fact that the patch was very small, required work wasn't properly formatted for immediate inclusion.

One thing I've learned from this thread is that as maintainer of a FOSS package, especially a popular one you are always going to get yelled at (to the point that people will make up reasons and put words in your mouth for yelling at you), no matter what you do. People are literally calling for the maintainer to leave.