Very annoying conversation at my lokal knit store

it basically went like this me: "so you have any plant based yarn or plant/acrylic mix, I want to knit something for my mum, but she's allergic to all animal fibers"

her: "we have 20% wool/80% acrylic, I can show you"

me: "no thanks, my mum is allergic to all animal fibers, so it should not contain any animal fiber at all"

her: "maybe alpaca mix? It only has 10% alpaca"

me: "she is allergic to all animal fibers, if there is any percentage of animal fiber, she will have an allergic reaction to the yarn"

her: "I can't help you, knitting yarn just is animal yarn"

at this point I left the shop and I just can't stop thinking about that last sentence????

the funniest thing is, I went back there a few days ago and a different employee kindly showed me their cotton yarns and plant/acrylic mixes.