I think part of the problem is it's impossible to tell at any given moment what his background is. Raised by assassins and in a test tube blah blah, that's supposed to explains his mad ninja skillz, adult professional level scientific knowledge, then there's him being rich which presumably is supposed to explain his remarks about real estate prices. There's the violent quips which seem to be about him not realizing he's saying something crazy. But since he's all about the one-liners he sometimes has to sound like a teenager in a movie, or a kid from South Park. Although one could make a case for him having no idea about homosexuality, having no associations between flamboyant clothing and homosexuality, etc.
The kid's only ten and it seems like every second of that should be accounted for in his adult-level skills and he has no interest in anything else. When did he come up for air long enough to notice gay stereotypes?