No it shouldn’t. This is rarely due to a food-grade stainless steel interior (although not out of the realm of possibility). It is recommended to always give your new bottle a good cleaning before first use, to eliminate any factory flavors that might be unleashed. Coffee can sometimes taste metallic due to extra minerals in the water such as calcium and magnesium. If this is the case, using bottled/filtered water when you are home brewing is your best plan of action.t