I too affirmed at my attestation, no gasps of shock or mutterings of "heathen" were heard.
As an aside, being a 'Benedict Arnold' I've never had an issue with the term 'spam' and I've been called it a fair bit during my service to Liz. Lets be honest, the use of food-based nicknames to refer to foreigners is hardly unheard of in the US yet I've never heard Brits getting precious about being called 'Limeys'.