Quit your crying snowflake.
Look at reality: most of these skate meet ups that are women/queer/trans focused happen during times of days when parks aren't that crowded, from my experience. If you can even name a time when you've been "marginalized" at a skatepark by some non cis-het-males then I guarantee that's the exception and not the rule.
Anyone who wants to learn how to skate should be able to feel comfortable at a skate park. I agree with one of the posters earlier, as a cis-het-non-white-male-bro even I felt uncomfortable at skateparks as a kid because of weird vibes people put out. If I was a woman or gay or trans then I'm pretty sure there's a high chance I'd feel even more vibes.
Even beginners should be able to feel good and have fun at the park. Should everyone, including newbs and queer/trans/women, learn the basics of park rules? Yep. And most of the Skate Like A Girl/Unity type groups that I've interacted with teach those as basics.
Anyone whining and crying like a little baby about this should go find a safe space to cry in, or just suck it up and realize that there's always room to learn more about something that you'er passionate about. In this case, it's OK to admit that you didn't realize that skating felt exclusive and required all these groups forming to make it more inclusive.
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On a separate note, I do think that the caption for that IG post advertising the skate meet up is wack. Still, I recognize it's being hyperbolic *and* it even invites people to come in the last part of the last sentence. So, am I bent out of shape about it? No. Would I write it in that way? Yes. But it's nothing to whine and cry about. Re-phrase it if you're all bent out of shape and post your alternative phrasing rather than be a little snowflake about it.
just because you can push and stand on a skateboard does not make you a skateboarder and certainly doesn't give you the right to commandeer a skatepark and tell straight male skateboarders that they're not welcome unless they go and adhere to a checklist of social duties laid forth by you. my dad can stand on a board and roll. is he a skateboarder? fuck no. these chicks are baffled why they got vibed at a park by real skateboards. I'm guessing its because your all hanging out on the flat bottom of the fucking bowl taking pictures for your instagram. they might as well be riding scooters. this is total appropriation of skateboarding. these girls belong in some backwood parking garage with gentle jones riding curbs.