It's absolutely okay for a girl to be taller than the guy!
There's no rule or standard that dictates a woman must be shorter than a man. Height is a natural variation among individuals, and it shouldn't be a factor in judging someone's worth or attractiveness.
Some people might have personal preferences, but those preferences shouldn't be imposed on others. Many couples find that height differences add to their unique dynamic and can be a source of humor and affection.
Ultimately, what matters most in a relationship is mutual respect, love, and compatibility. Height is just one aspect of a person and shouldn't be a reason to exclude or judge someone.