BuddyPress.org

You need a “global $bp;” call if you’re going to be checking for the displayed user’s ID.

Also you might want to add the filter on $avatar_dir just in case anyone is overriding it!

$avatar_dir = 'avatars';
$avatar_dir = apply_filters( 'bp_core_avatar_dir', $avatar_dir, $object );

Give it a shot!