I can understand how you might feel put upon js_040, but if someone believes that there has been a violation of advertising standards, reporting it to the ASAI is the right thing to do.
The person who contacted them did nothing wrong, no matter how it made you feel. They were wrong in thinking that you violated advertising standards, which I would have thought was pretty obvious, as your bottles do have “Brewed in the EU” printed on them, but it is not the consumers job to determine that. That is the ASAI's job.
“Traitor in the Camp” is an overreaction.