I've both donated and received life saving platelets...it could be that the needle was not properly placed...and it's been a while now since donating but I think the bags used to contain a specific amount of anti's for a specific amount of blood, and anything less than that amount of blood in the bag would render it unusable because of too much anti's.
The bedside manners sound like a careless newbie or someone that's burned out or a person that has slipped through the cracks just collecting a paycheck...I think letting someone know how you were treated could help them make needed corrections and would be a service to everyone. My veins are blown out from chemo so anytime I get bloodwork now at labs I always ask how long they've been doing it...if they're new I wait patiently for someone with experience...my days of being someone's practice are over, lol.
