Tony Hawk was active for a really long time. “Avid” means he did it a lot and enjoyed it.
Tony Hawk is the exception to the rule. I’m going on 58 years, I’m not much of a sports fan, but even I have heard of Hawk. He made a complete career from his hobby and was quite good at it. The average man will start job hunting at that age or study something with potential of: supporting a good upper middle class life. Maybe the shooter was stuck doing little boy activities and this girl wanted a man to date, not some penniless kid. I admit I don’t know the whole story. This girl had just been hired as manager of that store. Maybe she responded in some way that made the shooter feel small, and made to look as insecure as he felt inside.