The Reason for AA isn't because you're mocked or put under a situation where you aren't represented well. Its based off of the fact that blacks,mexican,NA, and etc are not given the same opportunities in school and hence their education process was much harder. Most people that are lgb don't come out until college most of the time and that doesn't affect the way they were brought up in elementary and high school
This is inaccurate in several respects.
First off, many URM's actually have higher household incomes, and better education, than most whites. So this clearly can't be the only reason for AA.
One primary reason for AA is because law schools feel it is important to have traditionally (politically) "unrepresented" groups have a greater voice in society. This is the only possible rationale for giving extra points to wealthy blacks and hispanics (which, of course, does occur).
Given that gays have suffered persecution equal to (or greater than) many minorities, it therefore only makes sense for law schools to seek out gay students, who will perhaps add their (minority) perspective to class discussion, and then hopefully act as agents of change and protection for others down the road.
I will note, however, that it would probably be inaccurate to claim that everyone was "straight" in law school 30 years ago. (Women and minorities actually started being admitted about 40 years ago.) Odds are, gays were a proportionate part of the population at the time -- they just weren't "out". By favoring gays, law schools would presumably be seeking to ensure that people can now be open about their orientation.
(And ultimately, unless you're applying to Liberty or Ave Maria, I do think law schools would probably favor an openly gay applicant at least somewhat over a traditional applicant.)
As far as economics goes, this to me should be a far greater factor than skin tone in admissions. If a primary rationale for favoring URM's is because they (at times) have less educational opportunity, then we should obviously favor all individuals who have less educational opportunity. The students around you are largely irrelevant to this analysis -- you'll be less well-prepared from college coming from such an environment, and you'll also apparently have a harder time doing well on test scores.
My advice: Hit both issues, especially the economic issues, if you reapply next year. (Obviously, the whole POINT of economic disadvantage is that you were STILL able to accomplish a lot DESPITE facing greater challenges than most. This bodes well for your success in law school, and as an attorney.
Finally, bear in mind that your LSAT will need to at least be close to the 25th percentile to have any chance at admission to most schools. If it's not close, you may want to retry.