You're correct that some mostly-liberal individuals hold conservative beliefs, but that's not proof of bias in the language. They're using the most accurate possible word, and if you disagree then you should take it up with Merriam Webster: https://www.merriam-webster.com/dictionary/conservative
Bold claim.
> MW: conservative: tending or disposed to maintain existing views, conditions, or institutions
LGBT advocates who want to keep LGBT institutions to advocate from, are then conservatives.
Please check your pre programming.
> LGBT advocates who want to keep LGBT institutions to advocate from, are then conservatives.
Sure. They're obviously socially liberal, but that would be an individualist and conservative decision to make.
As I said in the last comment; people who are largely liberal can also hold conservative beliefs (and vice versa). You could even claim in a post-queer world that LGBT advocates then become the conservative party. We don't live in that world though, so radical feminists that believe in trans-exclusion are still socially conservative.
Point is, these radical feminists are excluding males from their feminism. I really don't see how that makes them socially conservative.
For example, radical feminists tend to advocate strongly for lesbian rights, based around the fact that lesbian women are female with a sexual orientation exclusively towards others who are female. The right to experience their sexuality free from harassment, the right to enjoy female-only lesbian spaces, the right to keep the word "lesbian" exclusive to them and not have it redefined to include bisexual women or any type of male.
How often do you find social conservatives championing these lesbian rights? I would say very rarely, if ever.