Just to give some numbers to compare against:
I have a '93 Honda Civic with 147k miles. Since new, along the years, I've changed the engine oil exactly 33 times. Every single time I used on the drain bolt a 14mm Honda crush-washer (Honda part # 94109-14000), and I torqued the drain bolt with a torque wrench, to the 33 ft-lb, specified by Honda. I've never had a problem with a stripped pan, and I do not expect to have one anytime soon.
If your place where you do your oil changes does not install a new crush-washer EVERY TIME they change your oil, then you're better off buying them yourself and requesting that they install one. They are only $0.23 at my local Honda dealer. Just as important, make sure they use a torque wrench also, on that bolt.
If these people are the only shop who has ever changed your oil, they owe you a new, genuine Honda oil pan, PERIOD.
If this had happened to me, I would take them to Small Claims Court in a heart beat.
Let us know what transpires in the end.
Best of luck.