Anything to do with kids is pretty much going to give you a headache. Kids not treating their clothing well is usually learned from a parent not doing so. Huge pet peeve of mine is people talking about just leaving clothing in baskets/hampers instead of in dressers or closets (brain malfunction for the UK term, sorry) since they just have to wash them again/use minimalist living as the reason. So we're not dealing with some people that clothing is an item that they take care of anyway.
Mostly, when I am in my alteration shop I take care of the dresses far better then they do even picking it up. I have a hook and hangers for them to hang their clothing...most leave it on the floor, maybe pile it on a table I have in the corner (of which I had to take the decoration off because it was being piled on), the throw the dress into one of the chairs and I have had to get a sign made stating "do not hang clothing on dressing screen" (it's an antique and folds...not exactly the most stable and I don't want it scratched). Not day dresses, but wedding gowns. So taking care of a costume, well, at least they pick them off the floor.
This afternoon I went into the shop to pick up some stuff to work on at home. While I was there, I had a young 20s girl come in to ask if I could do some alterations by next week. Nothing major or even time consuming, but after seeing them I replied that I had a $5 charge for ironing the garments to begin to work on them (yes, they were this bad). This was work uniforms, not even nice clothing. Items she HAS to wear to get paid. After talking to her, she hadn't ever seen an iron in use in her life and didn't know how to deal with the wrinkles since they came out of the dryer wrinkled and she didn't fold anything so they stayed balled up in her laundry basket.
Long story cutting short: no, I don't get upset when my work is not treated as I would treat them. Few do, for one, and people just don't care how they look for the most part or don't know things are supposed to be treated in a different way. They pay me to provide a service, which I do to standards *I* have. If their standards are lower, well, I got a charge for that.