It's not fear, it's Trudeau's style. He knows he has to work with him, so he's going to. It's why he's managed to tame him in a way that none of the others in the group can (with the possible exception of Abe - Merkel doesn't have to tame him, so she doesn't even try).
"He knows he has to work" with him indeed, but with a trade deficit and Trump and his threats of ripping up NAFTA, the ball in in Trump's court and fear does play a role in the Trudeau's knowledge that he has to work with Trump.
In any case, I wasn't criticizing Trudeau. All I meant, is that I wish he were in a better position to troll Trump the way Macron did (he is PET's son, after all).
But he can't.