The comments here are a big surprise - I thought it was just me!
And no, I don't agree that shops can vary everywhere with staff and attitude. Charity shops must be different, they would have nothing to sell without donations and probably not enough staff to do a half decent job without the kindness and time of their volunteers.
We don't have such shops in France, more's the pity, but there are a few places to donate and it's always very much appreciated. Since an absence of greetings, please and thank you here in France is almost a criminal offence.....courtesy is always expected and shown.
I went with armfuls of good 'stuff' into a shop in the South of England a few years ago. Some almost new possessions of my late Mother. A beautiful, pristine Rollator/walker, pretty walking sticks and other bits and pieces. After being initially ignored, one of the staff interrupted her gossiping with a 'just leave it down there' before turning away and continuing to chat. What do you say? It's really difficult to be in combat mode when you're grieving.
Nobody should be allowed to do that work if they don't like people, if they resent giving their time and they can't even say thank you for the ability of the charity to profit from donations.
We read often of Gransnetters 'charity shop work', what hard work it can be, but we hear of the pride they show in their work and what they try to do for others. I actually wondered at the time what they would think if they could have seen what happened !