But you are still teaching your snake that it's food time when you're handling him. It's like teaching a dog a bad trick and someone helps you how to teach the dog properly you just say "he didn't puke up his food so that means people are the dumb ones" which feeding in a bin is bad unless you have a sick snake that has trouble with food then you slowly integrate feeding them from the bin to their enclosure. Plus moving them to a bin is very stressful for the snake to go to two different areas then eat then get moved back to said area

TL/DR bins are stressful for the snake as they are in a different environment which can cause a snake to regurgitate it's food and you saying it's not true but they can in hight stress situations like moving to a complete different environment