"What" he replies. "F..k off you dozy b.....D" "Oh right" and he moved.
I trust that you are paraphrasing, and that your actual remark was considerably more diplomatic (private aviation has enough opponents already, without creating new ones).
P.S. I see the term 'anorak' used quite a lot on this forum; generally in a derogatory manner. I infer that it means some sort of socially inept type, especially someone devoted to obscure or less-than-glamorous interests (e.g., birdwatching, aircraft spotting, MS Flight Simulator, etc).
Did I get that right?