Should You Bond With Stranger’s Kids?

This happens to me quite often, so I decided to share it. I was sitting next to this lady with a young toddler in the airport, and the kid keeps coming to me to play, he’s cracking up having a ball, while I’m just sitting there straight faced not saying or doing anything, but he’s having the time of his life. I assume it’s because I look like the real live version of one of his favorite morning cartoon characters. This kid had amazing energy and the Mother was clearly running out of patience, trying to keep him from bothering me. I’m not saying I’m always like this, but this time I wasn’t bothered and I said, “He’s fine.” When he came over to hang out with me, I could tell she could use a break, and I also understand she didn’t want to be bothersome. Is it out of line for you to hold strangers kids?