Hi,I want to get business M type

But , I reside in los Angeles, the employee in embassy told me that I need to go dc because in my invitation letter it doesn't consulate , it writes embassy, so if I travel to do can I get it , do they give me another excuse like I live in la so I can only get visa in la or so ?
Completely wasting time with unreasonable regulations, if they keep going I guess we don't do business anymore ,,,,