@Nullo I fail to see what logical fallacy I committed. Perhaps if you could name it and provide evidence for it, then I could understand your point. In the meantime, I shall restate.
You have justified discrimination against homosexuals as being a classic value. At least that’s how I perceive the statement: “a lot of what people call “homophobia” isn’t anything more than classic values being marginalized.”
I submit that other kinds of discrimination, such as against those with different skin color or against women are just as much classic values as discrimination against homosexuals. I can conceive of no case that can be made that racism and sexism were not societal values, not just fleetingly, but for centuries. Racism essentially from the moment of the first encounter between white and black people up to sometime in the Sixties (or later). Sexism from, well as far back at least as ancient Greece and in a continuous line from then until the Sixties (or later). It was considered disruptive to society to treat women or black people as the equals of white males. These were, without doubt, traditional values, and discrimination against homosexuals existed right alongside them.
The only argument I have heard that suggests that there is any difference between discrimination against homosexuals and discrimination against black people or women is that homosexuality is a behavioral choice not a natural born trait like gender or skin color. This argument is flawed because there is considerable evidence that homosexuality is a trait that an individual is born with, and the only real alternative to that is that it develops over time as the individual develops emotionally (nature vs. nurture). In either case, however, it seems highly unlikely that homosexuals make a simple choice to be gay. Gay is something they are, an innate part of them that they can no more choose than they can skin color or gender (perhaps even less so given the modern state of medical science). Discrimination against homosexuals, like discrimination against black people, Jews, women, Irishmen, Hispanics, Asians, Arabs, or any other ethnic or gender group you can think of is treating a human being entitled to less rights than other human beings on the basis of a characteristic that is part of who they are, that they did not choose, and that does not in any way impair their ability to do any job, be a loving parent or spouse, or be a good soldier. It is discrimination. It is no different from racial or gender discrimination, and like them it is a classic value that deserves to be marginalized.