const postMenuBtns = document.querySelectorAll('.postMenuBtn')
const postMenuLists = document.querySelectorAll('.postMenuList')
const postMenuToggle = (e) => {
// console.log(e.target);
e.target.style.color = "red"
const closestMenuList = e.target.closest('.postMenuList')
console.log(closestMenuList)
// .classlist.toggle("hideMenu")
}
for(const postMenuBtn of postMenuBtns){
postMenuBtn.addEventListener('click', postMenuToggle)
}
<div class="postMenu">
<button class="postMenuBtn">
<i class="fa-solid fa-ellipsis"></i>
</button>
<div class="postMenuList hideMenu">
<ul>
<li>
<button><i class="fa-solid fa-caret-right"></i>Usuń post</button>
</li>
<li>
<button><i class="fa-solid fa-caret-right"></i>Edytuj</button>
</li>
</ul>
</div>
</div>