In parenting, it’s always good to know your bias.
Ask me to wipe the boogers of someone else’s child and I get squeamish. But with my kids, I didn’t have any problem. There’s something about it being your own child that makes the unbearable, bearable. Now, Amy’s husband gets upset with her 11 year-old when he’s acting goofy but when his son jokes around he laughs with him. Having a tolerance for your own child’s boogers is understandable, but this dad had better recognize his bias or it will create resentment. Treat all kids the same.