Honest question. What is the distinction between trans-gender and trans-race?

At least in Canada we are rapidly building into law not merely protections for gender identity, but legal requirements for others to also recognize/embrace people's chosen gender identities(forgive me, I know at least in Canada choice is the wrong word but I'm mentally lapsing on a better one).

Yet, trans-race is still dealt with as a joke, with the trans-race individuals an acceptable target of ridicule.

My own opinions don't sit as far out on the left, but watching those that are content with both declaring trans-gender identity an inalienable fundamental right to the extent that MtF athletes must be allowed no matter how clearly their 'choice' was biased by getting to be #1 in their sport., but then ridiculing anyone claiming trans-race is hard for me to reconcile.

Anybody else able to provide a rational difference between the two? It looks to me like an entirely subjective I agree with one but not the other thought process, but maybe that's just my ignorance?

Moving this video to Mordhaus's personal queue. It failed to receive enough votes to get sifted up to the front page within 2 days.