I love that analogy. It is so uniquely British!!! 
Most Americans drink out of the can or bottle which I knew you Europeans just love to poke fun at us for. 
Having said that.
If that has been your experience, it might be worth trying another brand, as I suggested earlier. However, it’s important not to present this as a universal fact without specific examples or evidence, as it can create confusion for others in the community. Misrepresenting opinions as facts risks spreading myths or urban legends. If you have evidence or detailed findings, please share them so everyone can benefit from accurate information.