I too chose the silent response but I can't condemn those who booed, especially if they have been to all three away games. It's all very frustrating because with our first team we would have walked this group.
However, it hasn't spoiled my trip and I will carry on enjoying Prague until tomorrow morning before flying back in time for the Everton match. That one had better be good.
PS I saw a number of supporters who were at my last Euopean away match in Hamburg in 1984 and we didn't score then either!