Some places in UK, Ireland and Germany serve beers at room temp so I disregard their beer opinions.
Different types of beer should be served at different temperatures.
"The temperature of a beer has an influence on a drinker's experience; warmer temperatures reveal the range of flavours in a beer but cooler temperatures are more refreshing. Most drinkers prefer pale lager to be served chilled, a low- or medium-strength pale ale to be served cool, while a strong barley wine or imperial stout to be served at room temperature."
"well chilled (7 °C or 45 °F) for "light" beers (pale lagers); chilled (8 °C or 46 °F) for Berliner Weisse and other wheat beers; lightly chilled (9 °C or 48 °F) for all dark lagers, altbier and German wheat beers; cellar temperature (13 °C or 55 °F) for regular British ale, stout and most Belgian specialities; and room temperature (15.5 °C or 60 °F) for strong dark ales (especially trappist beer) and barley wine."