PKRG

@lamentira,

Thanks for your suggestion but I rather prefer not to alter the core files.

I added the function hook from Classic Smilies plugin directly to my functions.php.

function disable_emojis() {
	remove_action( 'wp_head', 'print_emoji_detection_script', 7 );
	remove_action( 'admin_print_scripts', 'print_emoji_detection_script' );
	remove_action( 'wp_print_styles', 'print_emoji_styles' );
	remove_action( 'admin_print_styles', 'print_emoji_styles' );
	remove_filter( 'the_content_feed', 'wp_staticize_emoji' );
	remove_filter( 'comment_text_rss', 'wp_staticize_emoji' );
	remove_filter( 'wp_mail', 'wp_staticize_emoji_for_email' );
}
add_action( 'init', 'disable_emojis' );

But the size of my “old” smileys was still bypassed by the hardcoded size added on each smiley (style=”height: 1em; max-height: 1em;”)

but thanks to classic smilies code, I was able to style them

img.wp-smiley, img.emoji {
height: auto!important;
max-height:100%!important;
width: 100%!important;
}

The problem is solved on my case.

Thanks for your help