Almost reminds me of an incident a few years back when I was working my first 'retirement job', p/t at an LGS.
Sold a customer a Ruger MKII (or a MKIII, can't remember).
He had a few bobbles on feeding bulk ammo first time out - so brought it back. He was retirement age, and must have told to me, the manager, the owner and anyone else that would listen that he was a 'Certified Engineer' about 11 times and that the pistol was not designed correctly, nor manufactured correctly.
After 30 years of dealing with the public - I thought, 'Oh boy, here we go....'.
The usual advice was given regarding cleaning a new pistol, and that .22 autos of all stripes can often show an ammo preference, proper locations to use a LITTLE lube, etc, etc.
Nope - didn't wanna hear any of that nonsense. He was a Certified Engineer.
We implored him to follow our advice, GAVE him some CCI .22 LR HV ammo and he finally left.
Was back in a week or so. Seems that CCI ammo DID work fine, but the pistol was still designed incorrectly. He knows because he's a Certified Engineer.
This time he brought a large 3-ring binder showing his college diploma, certifications for some type of engineering, awards for design, etc. (We're having fun now, at $10/hr.....
He also drafted a 3 page letter to Ruger Corporate outlining their failures in the design of this pistol.
The owner offered him a full refund on the gun - it would sell quickly in the used cabinet. No - he didn't want that.
He wanted US (the LGS) to send the gun back to Ruger with the letter and copies of his Engineering achievements.
The owner refused, going back to the refund offer. He left in a huff, and indicated HE would be sending it back.
Not sure how it all ended. Never saw him again, which was OK.
And folks wonder why LGS clerks are not always a ray of sunshine.........