You should be ashamed of your condescending reply to the OP. The tone was rude, and to top it off, you’re wrong.
Many industry professionals use the terms 380 ACP and 380 Auto interchangeably. The same is true for 45 ACP and 45 Auto. The head stamp and SAAMI designations serve a purpose, but it’s silly to suggest they must be used exclusively.
For example, if you look at the current website of MidwayUSA, you will see that they list 9 X 17mm ammo as “380 ACP”, and 11.43 X 23mm as “45 ACP”. The website of Natchez Shooters Supply does the same. Brownells lists them with both designations on the same line: “380 Auto (ACP)” and “45 Auto (ACP)”. To complain that only the exact SAAMI head stamp should be used in this context is as silly as saying the decimal point shouldn’t be ommitted before the caliber numbers.
The same thing can be said of the 7.62 X 17mm pistol cartridge being called 32 ACP and 32 Auto, and 9 X 19mm as 9mm Parabellum and 9mm Luger.
You owe the OP an apology.