The Battle of Hastings, 1066 and all that, was responsible for an awful lot of anti-French (or at least anti-Norman) sentiment long before Agincourt.
Depends on how you look at it & who you regard as a Briton - or typical Frenchman for that matter. The Normans were responsible for much of what we regard as traditionally English today.
'...the peoples have become so mingled that no-one can tell...who is of English and who of Norman descent.'