I never judged other games negetively due to a lack of blood (granted, I do like blood in games, but it isn't going to ruin my day if there isn't a hint of gore to be found). I like quite a few non-bloody games like: Dave Mirra BMX, Guitar Hero, Simpsons Hit and Run, Vectorman, Metroid Prime, PGR4, Soul Calibur (there may be fighting, but there isn't any blood) and Armoured Core.
Also, I never said childish games weren't fun, I merely said that I (and others who are my age and up) are probably too old to be playing them, that is a completly different statement all together.
Also, isn't the personal definition of what is socially acceptible and non-acceptible useually centred around past experiences regarding what you like and do not like? In other words, wouldn't my definition of fun be defined by what I find entertaining or acceptible?