Remove CSS and/or JS for Select2 used by WooCommerce, see http://stackoverflow.com/questions/28547598/how-to-unload-select2-script-styles-loaded-by-new-woocommerce-2-3-x.

gistfile1.txt

// Remove CSS and/or JS for Select2 used by WooCommerce, see https://gist.github.com/Willem-Siebe/c6d798ccba249d5bf080.

add_action( 'wp_enqueue_scripts', 'wsis_dequeue_stylesandscripts_select2', 100 );

function wsis_dequeue_stylesandscripts_select2() {
    if ( class_exists( 'woocommerce' ) ) {
        wp_dequeue_style( 'select2' );
        wp_deregister_style( 'select2' );

        wp_dequeue_script( 'select2');
        wp_deregister_script('select2');

    } 
} 

Note that in more recent WooCommerce versions (I believe starting with 3.2 but couldn't find a hard confirmation), there is a forked version of select2 with a different name: selectWoo. So the code would then be:

// Remove CSS and/or JS for Select2 used by WooCommerce, see https://gist.github.com/Willem-Siebe/c6d798ccba249d5bf080.

add_action( 'wp_enqueue_scripts', 'wsis_dequeue_stylesandscripts_select2', 100 );

function wsis_dequeue_stylesandscripts_select2() {
    if ( class_exists( 'woocommerce' ) ) {
        wp_dequeue_style( 'selectWoo' );
        wp_deregister_style( 'selectWoo' );

        wp_dequeue_script( 'selectWoo');
        wp_deregister_script('selectWoo');
    } 
} 

This is the working code till today with latest woo version (19/11/2018 - Woo Ver: 3.5.1)

Sometimes "Select2" dont render in first page load, giving to the user a simple text field ... so I am going to sidable it in each of my new projects.

Thanks!