1. This couple's new Charles Schwab broker can't see the Former Broker, except perhaps as a tiny image in the distance. Online conferences don't work this way. When the new broker says "hi" and waves, she's just assuming that her clients aren't insane and that there really is someone there to say "hi" to.
2. The new broker probably thinks her clients are insane. Who could be so dickish as to do something like this? "Oh hi, person we fired. Say hi to the person who replaced you." Seriously, I'd just tell these people "f-- off, former clients. I'm on vacation."
3. And as long as I'm imagining what I would do if I were the Former Broker, I'd remind these dicktards that they are on vacation at a fabulous beach...and this person they are talking to on their little screen is their NEW broker. That means that I wasn't doing such a bad job now, was I? You ungrateful jackasses got yourself a gorgeous beach vacation but I guess that wasn't quite good enough, because you dumped me for a new broker who has done what exactly for you? Snark on me if you are back at this vacation spot NEXT year, after you've given this new broker a chance to play with your money for a while. And if you find that you aren't in the financial position to vacation here next year, well, sorry but my client list is full. Go pound sand, you knobs!