Disable "Add Friend" Button For admin Profiles.

yzc_disable_addfriend_button_for_admin_profiles.php

<?php

/**
 * # Disable "Add Friend" Button For admin Profiles.
 */
function yzc_disable_addfriend_button_for_admin_profiles( $html ) {

    $displayed_user_id = bp_displayed_user_id();

    $user_id = ( $displayed_user_id ) ? $displayed_user_id : bp_get_member_user_id();

    if ( is_super_admin( $user_id ) ) {
        return '';
    }

    return $html;
}

add_filter( 'bp_get_add_friend_button', 'yzc_disable_addfriend_button_for_admin_profiles' );