I haven't read the science behind the decision but assuming it's airtight and the report gets released for everyone to have a look at then it's by no means an inherently bigoted move - it's a difficult and fraught issue and all anyone can do is try to be as fair as possible in the knowledge that no ruling can be perfectly fair for all.
Regardless, it seems very harsh on the current generation of trans people who have done absolutely nothing wrong but who now find themselves the wrong side of this ruling. Most of the trans people I know wanted to transition a lot earlier than they did, but that option wasn't available to them for a variety of reasons, whether it was a lack of knowledge or support from parents, gatekeeping by bigoted medical professionals perpetuity, a lack of access to support. It feels as though trans athletes are being doubly punished for the failings of others, once because they weren't able to get the medical support they needed earlier, and again because the failure to give them that support when they needed it may now cost them careers they've worked very hard for.
I think, in here at least, that the majority of those who are supportive of this ruling bear no ill-will towards trans women. I'd ask those people to lend their support to campaigns working to ensure young people questioning their gender get the support they need, including access to puberty blockers where appropriate. Because ultimately, unless that support is there, there's little difference between a tough but science-led decision which unfortunately excludes this generation of trans women athletes and a de-facto ban on trans women competing in top-level sport in perpetuity on purely ideological grounds.