Is it normal to think girls practice seduction
On few occasions I noticed that girls seem to practice seduction on random unsuspecting guys with whom they otherwise wouldn't want to have anything (you are not her type, she is taller than you, she's way younger etc.). They just tease (sometimes really hard) to try to win your reaction. If you try to esablish contact they will deny any interest in you.
I think they are practicing so that when they see a guy they really want they can up their chances of "catching" him.