I've had my oil changed by one of those quick change shops for years, but after getting it changed last Friday I discovered a leak. I took it back to the shop and they said the threads in the oil pan drain were "worn out" and so they had to put a "longer" plug in.
Then they showed me the old plug (pictured below.) I have my opinions about what happened here, but I would like to hear from other owners about whether or not they have had problems with the pan's drain plug threads wearing out.
Please tell me what you think.

Specs:
2007 Mazda 3 2.0 sedan (stock)
122,000 miles

 

Tightened with an impact!

 

That's what I thought. A guy at the shop they only hand tighten the drain plug.

Has anyone had their threads just wear out?