Depends on their argument for why we should ban it

The truth is that gender confirming care has been proven to significantly lower depression, suicidal ideation, etc. (although you do have to account for outside influences, i.e. rampant transphobia and intolerant families/societies that may make an indicidual more depressed after transitioning) in transgender individuals, as well as having some of the lowest regret rates, leaving no good reason to ban it.