Definitely write to your MP. If it’s a sexist man ask about indecent exposure and sport. You don’t have to be erudite and articulate. Just ask the questions. Ask them to explain why, if statistically 37 people who show up at gender clinics will have gender dysphoria, 2000 of them showed up last year alone. Most of them girls.
Send a letter in the post as well as email. Say in the email that you’re sending a hard copy and say on the hard copy that you emailed. Sometimes emails get ‘lost’, but in this day and age, an actual piece of paper is harder to ignore.
Even if your MP is a complete dinosaur who you think won’t give a toss. Point out that 50% of their constituency is women. Who are now legally undefinable.
Be outraged. Stonewall include crossdressers, officially, under the heading transgender. Ask how that fits in with protecting women and girls from straight men, who are fully intact in terms of genitalia, and have a fetish.
The problem with all this is that unless you have something of a feminist lens, talking about gender as stereotypes goes over the head of a lot of people. Particularly for those for whom stereotypes are more beneficial (men) and have never had to think about it.
Ask them how they can be supporting legislation that will allow every paedophile in the country to identify as a woman and hang out in the female changing rooms during mother/toddler swim sessions, throughout the summer holidays, etc. And since it’s not a crime for woman to be naked, what safeguards would there be to prevent him from being so. Point out you’re not suggesting that transpeople are paedophiles, but obviously paedophiles can exploit this. And since they go to extraordinary risks and can spend years grooming child, why on earth wouldn’t they. So much easier, and legitimate, than hanging around swing parts and the school gates surreptitiously. (Seriously why havent they thought about this and how can they now backtrack).
Ask them if they support the #metoo campaign and why on earth they would think there are not numerous predators out there who would exploit this.
Especially as, and this is important, a man has to do nothing to be considered a woman. In terms of appearance. Show them the picture of Daniel Muscato who tweeted from a woman’s homeless shelter, deliberately on International Women’s Day that if you don’t believe he’s a woman you can suck his dick.
Asking why they are expecting women and girls to share their intimate spaces with men who threaten rape.