I don't think anyone is intentionally "bullying". You need to remember this is as much a business transaction as anything else. Taking away emotion, there is a supplier with a product, customers, and an exchange of money. Any "customer" has the right to ask as many questions as they want after the "supplier" has received "money" and the "product" has not been yet been delivered. As to if the questions are "friendly" or "bullying' is all relative.