JSFiddle - React, Tailwind, and code Playground

HTML

<ul class="shortcode_menu">
    <li class="mozek"><span>AAA</span></li>
    <li class="mozek"><span>AAA</span></li>
    <li><span>AAA</span></li>
    <li class="mozek"><span>AAA</span></li>
</ul>

JavaScript

$( ".shortcode_menu li" ).each(function() {
        if ($(this).hasClass("mozek") == true) {
                    $(this).children('span').hide();
        }  
});