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If someone is late about 70% of the time, and you expect them to be on time, that’s a rather foolish prediction, isn’t it? They may be on time, but they probably won’t be.
What many people will do is get angry with the friend who’s frequently late. Does this usually change that person’s behavior? Perhaps sometimes, but it usually has little or no effect. The person will most likely continue being late at roughly the same frequency.
Wanting a person to change doesn’t change their behavior. It’s more likely to cement the behavior in place since people tend to resist others’ demands of them.