Hide WordPress admin bar for specific roles

functions.php

function disable_admin_bar_for_roles() {
	// Add here the roles you want to not have admin bar.
	$excluded_roles = [ 'subscriber' ];

	return is_user_logged_in() && ! array_intersect( wp_get_current_user()->roles, $excluded_roles);
}
add_filter('show_admin_bar', 'disable_admin_bar_for_roles');