I have to disagree. I bartended while at Uni, and questions like that really annoyed me. Firstly, I don't like beer, so asking me which I prefer is a pointless question. By all means ask me what the beer is like (wheaty, light, fruity etc) or what it is comparable to (similar to Guniness, or Bud etc) but asking a bar tender a personal perference doesn't make sense to me. Especially when they are asking about something I genuinely don't like in the first place! Secondly, if someone asked me if I prefered Cointreau or Chambord, I know what I would answer, but why would that affect your choice? I may really like raspberries, so pick the Chambord every time. You, on the other hand, might be craving something citrusy. If someone asked me that question, I would a) be honest and say 'I don't know' when I don't and b) try from there to ascertain which the customer might perfer 'Do you like a darker beer / citrus favours' etc depending on what is applicable.