If people are cutting Barclays slack, perhaps it's because the guy on Twitter is painting this as a satanically evil deed when it was probably just someone making a stupid mistake.

Additionally, the aggregate bandwidth cost of delivering that JS file during its lifetime is probably less than $0.05. How many copies of this file would need to be concatenated to equal the size of David After Dentist?

No one levels up on the Internet — and especially Twitter — by being calm and reasonable.