Thank you for this, it is very clear and factual, and that's welcome in a discussion like this.
It still doesn't explain what is different now, and requiring of an identity, a name, a label, a flag, a day, when there have always been people [including in my own family, and I'm sure other posters know similar people] who experienced and spoke of
' the absence of those feelings towards anybody, male or female'
which you describe.
So I think the point that you're missing is that it's not new, and it's not unusual,
it's completely accepted, nobody 'hates on' people who are not sexually attracted to other people, that's just who they are and how they want to live their lives.
And of all the non-straight sexual identities, it was historically, and in parts of the world where you may be killed for being gay or lesbian still is, the least dangerous one - has it ever been a criminal and possibly capital offence not to be sexually attracted to anybody?
It's because of the ordinariness and familiarity of people who are not sexually attracted to other people, and the relative safety of that identity, that the whole day/flag/label/oppression discourse is rejected as being a '5 minute' thing.
The objection is to the discourse, not the people.
.