1. There's not a massive amount of research in this area but there's absolutely some biological and neurological factors that at least have some effect on sexuality (https://www.newscientist.com/article/dn25121-anti-gay-uganda-claims-sexual-orientation-is-a-choice/). It's certainly not "learned".
2. More people are coming out because there's a significantly lower chance of them being attacked, harassed or looked down upon. I don't see how the influence of the mainstream media will suddenly make someone want to come out in the way that you're implying - gay people will be more inclined to come out because there's significantly more social acceptance. if someone who isn't gay has these "morals shoved down their throat" and "comes out", they're not coming out; they're simply lying.
3. This point is one that I take really great issue with. Sex ed has been a compulsory part of the school curriculum across all years and all states for a long, long time. Kids aren't told that being gay is awesome and they should totally try it out, they're taught about sexuality, gender, safe sex practices and general biology in a totally partisan way. (https://www.australiancurriculum.edu.au/f-10-curriculum/health-and-physical-education) It's pretty clearly important for this to be taught, and your implication that it's a "conversation for parents" makes a lot of assumptions:
-That the parents themselves have been educated properly
-That the parents are willing to teach their kids about the aforementioned matters
-That the parents are capable of teaching in a way that encompasses all viewpoints and possibilities.
Having a shitty sex ed curriculum and relying on parents is how you get stereotypical rednecks.
Girls start (generally, there's cases of it beginning as early as 4, 5) puberty between 9 and 14, boys between 11 and 16. 10 is a pretty fair age to discuss sexuality and sex in general, I'd say.
You're extremely poorly educated.
And you're a dick about it too.
This is not how you apologise for making a joke in extremely poor taste with the only prior context you being a fuckwit.
I'd say that supporting LGBT+ rights and supporting child abuse are fairly different.
Cite your statistics.
Are you 12?
1. Certainly your perceived popularity of the term is skewed by where you're looking, which you addressed pretty well in your latest post.
2. I'm not well enough versed to say anything concrete on this, but I believe that LGBTQIA/+, which certainly represents them in name is probably the most common abbreviation outside of the original LGBT/+.