Well, I watched both videos (which I found very interesting) and I'll put in my two cents. Oh, and I really hope that poor kid who paints his finger nails doesn't get beat up at school.
I never played with girls toys (my favorite toys were airplanes and trains), but I do have videos going way back of me singing and dancing to music from Grease

. They're hilarious and yes, I would say that they look "stereotypically" gay. I don't have a lisp or cross my legs really tight, but I do sometimes to put my ankle on my opposite knee while sitting, therefore my legs aren't always spread and straight out in front of me. I definitely talk with my hands, and also have always been more attuned to others and very sensitive, but not dramatic or overly emotional about anything. I have one older sister, and both parents are home regularly and I got along with them great as a kid. My mom is the oldest of four girls, my grandma one of 3 girls, and my dad an only child. No history of homosexuality in (at the very least) the past 2 generations. I did spend a lot of time with women when I was young, usually me and my sister plus my mom, grandma, or one of my aunts. Not to sound like an asshole but I would consider myself a masculine homosexual. (At the very least I am attracted to masculine men, not feminine men.) I learned to swing dance pretty easily and I'm told I'm good (even though I don't like to do it in public), and otherwise have no artistic ability whatsoever. My good friends are all guys except for one.
Now, my sister's gay friend grew up without a dad and with a sister and a drama mama. He didn't really have a lisp but his voice sounded gay (forgive my stereotyping but after all, that's what the video was on). He talked a lot with his hands, did drama and was an amazing dancer. He didn't come out until the day after high school graduation, but I had been guessing he was gay for several years. When he came out, his own mother and sister didn't talk to him for over 6 months. Somewhat feminine looking, feminine acting, and extremely dramatic and artistic. Hung/hangs out with mostly women and very few men.
The last gay male I know well is one I've grown up with. He's in my grade, and we went to all the same schools from elementary to high school. He has one straight older brother and both parents have been present and loving. He never had to come out, his parents always knew he was gay and they don't have any problems with that at all. Of his mom's three brothers, two are gay. He is an amazing actor, singer, and dancer who talks with his hands and has the stereotypical "gay voice". Everything he says and does is extremely dramatic and usually loud. Very feminine, hangs out with all women.
What does all of this bantering I'm doing mean? I don't know. It could be genetic, though I really hope not for fear of future genetic testing shortly after conception for homosexuality. I mean, they do it for genetic diseases, I imagine someone would do it for homosexuality. It could be how we were raised, but each of us were raised differently. So anyways, it could be anyone's guess.