Revenge was something Raelle never took seriously. Besides, even if Le Xiaye insulted her, Raelle didn't think she had to deal with Mayor Le for that. Perhaps, he really wasn't a good father who did a bad job at teaching his only daughter. But for that, she'd just send him books to help. Why bother ruining his career?
In all honesty, she didn't deal with him because such a small fry really didn't deserve her attention. She'd be wasting too much of her time if she started caring about any Tom, Dick, and Harry.
Since Mayor Le couldn't just leave the event, he soon came back to join them but he was sweating. He continued to make his presence small to avoid offending anyone else at this table. He just wanted everyone on this table to forget all about him.