Ok, here comes the two cents from the bike shop owner...
First, I am SO SORRY that you experienced that. As an owner I cringed as I read your post. But I would want to know about the incident. Unfortunately some shops tend to hire young kids that "seem mechanical" and hope for the best. They may have one seasoned mechanic, but he gets stretched thin picking up after the others. We have a shop down the road that does this, and we are constantly fixing what they messed up. Sometimes it's scary.
I've also noticed that this can happen if the owner of the business is not actively involved in the day to day operations. At trade events I have met many owners that seem more like investors than owners. They have no interest in bikes?? That baffles me!! The industry is definetely not one to get rich in.
I would defintely write a letter to the owner. Not the manager- the owner. Often the manager is just as bad as the mechanics. Think about it- in many shops the manager HIRES the staff.
As for their idle chat. It happens. I often have to tone things down with the boys in the back, and one of them is my husband!! Though they are professional enough to know NOT to do it when there are customers in the store. Let's just say that if they had their choice the atmosphere would be MUCH different than it is. And unfortunately it would be like most bike shops that are out there. That is why I wanted to open a shop. I was tired of dealing with it. But old habits die hard.
As for the poster. I actually think I have seen it. I think it's a marzocchi if I remember correctly. It is tasteless, and it would NEVER be in my shop. But it doesn't surprise me. Actually Knog had a POP (point of puchase display rack) for the computers they came out with that was downright pornographic. It was cartoonish, but very bad!! I was actually shocked that they thought the US market would use it, but I'm sure some have.
Anyway, Defintely have your local shop look at her when you get home. Hopefully no damage was done. And if it was, have them document it and send a copy along with your letter to the owner. I would expect that they would issue you a refund. Oh- and 80.00???!!!! What did they do?? Holy smokes that seems steep!
Good luck!