WTAF. This is unacceptable. What happened to boys pinging your bra strap and that being annoying. This is really dangerous.
I am also outraged because I don't know for sure but I suspect this isn't happening in private schools which are generally calmer due to smaller class sizes and separate gender houses.
If it is going to continue like this then I think separate gender teaching is the only answer. It's completely unfair on girls education to expose them to this.
There needs to be absolute fucking outrage because it should not be accepted as the norm.