How do you all deal with someone telling you to just let your baby cry it out if you don’t believe in that?

My cousin who doesn’t have kids is like don’t complain about getting no sleep. You don’t let them cry it out. And I’m like I wouldn’t be able to sleep hearing that and after reading articles I don’t want to do

Anything that could possibly damage my kid. And she’s like my boyfriend had to cry it out and he has 0 problems🙄