Whatever yoyobrain, many of us here were also JW kids and gre up 'defending our beleifs' just like you did. You get no special merit badge from us here for that.
Yes, it takes courage for these kids to do this. The sad thing is, they (espcially the little ones) are doing so simply because mom and dad told them to. They have no idea why they can't just the ambigous 'god hates Christmas' crap. When pressed as to why, that's the 'couragous defense' a) god hates it, and b) mom and dad said so.
All the while, in the back of their head they are asking themselves 'what's really so wrong with this?' or more likely just being a kid and really wanting to join in with their freind in the fun times being had.