My first centerfire pistol was a Walther PPK/S in .380 ACP I carried it for a good 3 years before I finally decided that I'd rather carry something smaller/lighter in Summer, and bigger/more powerful in Winter.
Nowadays a Ruger LCP is my primary Summer Carry/BUG and my Winter Carry is a SW40VE, but I still carry the PPK/S occasionally just because it fits my hand better than the LCP and it's more accurate as well.
The supposed ineffectiveness of .380 ACP is largely based on outdated information or otherwise outright misinformation. For a time, .380 ACP ammo was downloaded domestically thanks to the popularity of the infamous cheaply made Ring of Fire pocket pistols of the time, but European ammo remained hot because of high quality pistols like the Walther PP(K), SIG P230, and Beretta Cheetah, as a result, .380 ACP was written off as a moderately effective mouse gun cartridge in the United States, while in Europe it was carried by Law Enforcement well into the 1980s.
Fortunately, the Ring of Fire companies are no more, most of which were sued into oblivion, so ammo is once again being loaded to full SAAMI Specs for the high quality pocket pistols of today.
Everyone else tends to be someone who knows someone who's father's brother's nephew's cousin's former roommate had a .380 ACP fail in spectacular fashion to get the job done or otherwise the token insecure 9mm Fanboy who insists that anything less powerful is totally useless, as is anything more powerful because it makes follow up shots take .0003 nanoseconds longer and according to the same authority they insisted were an invalid/untrustworthy source of information 5+ years ago before they issued 9mm, there's no meaningful difference between 9mm, .40 S&W, and .45 ACP.