Strictly speaking, nothing about acknowledging the existence of gay people, lesbian people, bisexual people, intersex people, and other kinds of queer people compels you to acknowledge the existence of transgender people, but it seems a weird place to land.
Some of course continue to deny the validity of every single letter in LGBTQ, but that's a shrinking and increasingly irrelevant minority view.
I can’t imagine any reason to plant your flag here against the letter “T” only, other than to be contrarian on purpose, or to slot easily into the Average Republican Viewpoint on This Issue, Circa 2023.
All the arguments against transgenderism amount to rehashed versions of the arguments that were deployed against gay people not long ago — “it’s all in your head,” “you’re confused,” “it’s a phase that will pass,” “you’ve been brainwashed,” and, of course, “it’s unnatural/sinful/against God’s will.”
Far too much discrimination occurred against gay people under the cover of those arguments for decades for us to be confident we’re not making the exact mistake with respect to trans people today.