How to handle a partner who always gives into child’s tantrums

My husband is a wonderful father, although he is way too easy on our kids in my opinion. He’s at work 5-6 days a week so when he’s home he just wants peace and doesn’t want to hear the tantrums and fights. Me however, I can put up with the crying and tantrums, because I know if I give into my sons requests (he’s almost 4) he will walk all over us. For example, if my son just wants to snack and hasn’t had a proper meal, I stand firm and say no however my husband asks me how about just a cookie or juice (for example). If my son wants to get away with not brushing his teeth, my husband lectures him but he still gets away with it. I’m definitely the parent that our son knows will not budge. How does everyone deal with a partner who is softer?