Even now I identify as a woman based on my gender identity, not my biology.

If you are referring to gender identity, not biology, with the letter combination “woman” then there are many adult human females who aren't women in your usage of that letter combination, including me.

Those men were speaking for themselves as trans men, not as females.

They can’t speak as men as they aren’t men. Their nipples are targeted due to their femaleness, not their transness, and that makes it a female issue, not a trans issue.

GCs always talk about the need for female only spaces, so I don't understand why they don't understand that trans men also need their own spaces.

GC hasn’t lobbied for female trans subreddits getting banned so GC isn’t stopping these female people from having their own spaces. We just don’t pretend they are men so we are not going to pretend their female issues are manly issues.

Women, men and enbies get periods.

You are talking about human females so these are all women or girls.

So it's wrong of me to hate my period?

No.

Not always though. But a trans persons experience is a trans person's experience. A cis person's experience is a cis person's experience.

I guess genderists have unique experiences regarding experiencing gender identities so I’m not going to tell you what it is like for you to have a woman gender identity as I have no clue. I would never claim my experience is the same as male trans people who want to be women as wanting to be a woman is unrelatable to me. Dysphoria isn’t a trans exclusive experience though and I can relate to female people who dislike being female as I am a female person who dislikes being female.

I read articles by trans men, subs for trans men, watch video's by trans men about being trans, etc. At least when I listen to trans men's words, I work on myself on being a better ally.

I have talked to many trans people and listened to them but I have never cared to be an ally to the movement as I consider it non-scientific, sexist and homophobic.

GCs act like they are supportive of trans men

I don't act like I am supportive of validating the gender feelings of female trans people. I support their right to get abortions etc but I think they care more about me not pretending they are men so I’m not under the illusion that my views would be popular among female trans people.

I believe GCs need to stop complaining about how trans women mistreat trans men.

I have never complained about it but I also don’t see why it would be wrong for a person to use their observational skills. Either something is true or it isn’t, and if something is true then it’s true regardless if GC is popular among female trans people or not.

I will bet all of my life savings most (if not all) will pick the trans community.

Of course, and I would make the same bet as you. You talk a lot about GC supposedly being under the impression that female trans people would consider GC their number one ally (lol). I not going to say stupid people don’t exist but I am not a person who believes female trans people see GC as their ally. If you want to rectify people who believe that then you speaking to the wrong person.