When a girl ignores him,he attacked not that girl but a social group out of misogyny or some other socio-political perception of injustice. So it is still terrorism. The point of the attack is to affect political(at the social level) change.

This really is similar to jihadist terrorism,jihadism took away american's privacy and mass shooters with gripes against american socio-politics have americans living in trauma over active shooter drills and gun toting teachers. Not only are they both terrorism, they both won!

Al-qaeda is eradicated but they won, I fear many would credit 9/11 as the begining of the end of america. Much like insurgent warfare,terrorism will be studied as a means of warfare where due to extreme imbalances on weaponry and digital surveillance the only way to fight is by terrorizing your enemy. War is horrible but terrorism is a cancerous form of war where destroying your enemy does not translate to success.