What's wrong with Justine, he's a youthful progressive PM and since his policies support junk science around gender, he'd probably prefer to be called Justine.  Better to be safe and politically correct not to offend, so Justine Trudeau won't be offended.  

Better yet why doesn't he change his children's gender designation to Unspecified, since they love forcing on everyone else.  What's good for Canadians is good enough for Justine.

He's soooooo enlightened and photogenic, he wears those fancy socks with arabic writing, and he's so comfortable prancing and prancing and prancing around at any pride parade, Justine is such a progressive he'll hand $10.5 million tax free to terrorists, what an enlightened Justine, They/IT/ Zir/Zim/Dishrag, whatever prefer to be called by their chosen pronouns and  names so Justine is again totally appropriate.