Is public shaming good parenting?

I wouldn't do that. At max child could only be told off in front of his/her family. The point is only to make them realise their mistake which you could do by telling them how their actions adversely affects others and even themselves. Public shaming could make them feel so uncomfortable and embarrassed that they might stop listening to you at all out of anger. They respect you and what you say, you would not want your child to devalue all this because of your constant complaining in front of others. Do not loose your child's faith.