Since you are opposed to that, why do you choose to be part of one such '-ism'?
I don't. I said I was a feminist, not that I was sexist. Wanting equal opportunities for women is not the same as wanting to discriminate against males.
You can't advocate for one sex without, as a first step in everything, defining people by their sex (it's obviously impossible to advocate for group X without defining people in terms of being X or not-X)
If you're going to oppose prejudice by people who use a definition of X, you end up engaging with their definitions. I'm not defining people by their sex, I'm opposing prejudice by those who do. Yes, that means that if I encounter people with prejudices against women (group X), I oppose prejudice against "women" (group X). When you oppose wide-spread prejudice do think it is effective to not recognize a pattern? By all means oppose defining people by their sex if you wish. You'll probably get my support. But telling people they can't recognize the form of prejudice they oppose isn't doing that.
I've met a fair few feminists (or more accurately "feminists" since they advocate sexual equality and therefore aren't feminists)
So basically, you are refusing to accept how we define ourselves in favour of imposing your own definition on us? A definition at odds with both the majority of people who self-identify as feminists and at odds with the traditional meaning of the term.
who, after years have passed, spent a lot of their time pointing at examples of feminism and saying that feminism isn't meant to be like that (as you have just done in your post). Yes, it is. That's the whole point of it. That's how it's always been. That's how it is. That's how it always will be. That's its purpose.
And yet, it's not and the majority of self-identifying feminists would disagree with you. You're doing some strange variation on the No True Scotsman and discounting anyone of my position from being a feminist whilst I am not doing the inverse. I don't claim that everyone who self-describes as a feminist shares my exact position - that would be absurd. Like claiming that because both Malcom X and Martin Luther were Black Rights activists, that their positions were therefore the same. You, however, insist on imposing your own One True Feminist definition and telling me (a feminist) that I can't be one because I don't fit your personal view of what a feminist must be.
I can support my position - it's simply that those who believe in equality are the huge majority of self-describing feminists and that is so. I've been an active feminist on and off for nearly two decades and feel I have a pretty good idea what I'm talking about. You can't support your position - it's that huge numbers who call themselves feminists can't because they don't fit your definition and that the traditionally recognized definition of feminism is wrong because you disagree with it.