I have seen reference to a pair of P-51s shooting down the first MiG-15 downed over South Korea.
P-51 Mustang - Conservapedia
I'm sure I remember reading something of this in Orbis' 'Illustrated Encyclopedia of Aircraft' in the early 80s.
.... tell him he is full of ****e ....
Under the circumstances, Crack On!!
However, it's not unreasonable for the non-pedant fat-bloke-down-the-pub-type-chap to confuse the Merlin and Griffon.