What should I do

I don't know where to post this so sorry if its in the wrong room , So me my husband and my son have a movie night every Saturday. thats our time with him when his little sister is asleep. So I told my son to pick a movie while I got him some snacks and out of all movies in this world he wants to watch the documentary 'BULLY' he's 5y about to be six in December. I told him me and your dad are going to have to talk about this before you get to see it ,my husband doesn't like the idea of him seeing this because it involves suicide unfortunately. We ended up watching a different movie but Now he won't stop asking to see it . Should I just say no that its not the right time for him to see this. Or whats the right way to go about this