What type of person still bullies when they're 25 years and older?

My older sister confronted one of her HS tormentors (a guy that tricked her into liking her back and did a cruel stunt on her, had others record it and humiliated her; others laughed), this is what he callously said:

''Yeah it was HS and we were kids then. I just didn't give you the time of the day. Life goes on.'' When she got upset and further confronted him, he told (with a smirk on his face) ''And you'll still acting like the pathetic loser you were and always will be, begging for attention, begging for love, trying to fit in where you don't belong and right now you're stuck on the past, let go already''. Then he left laughing, in the same laugh as when he was a teen.

It's been a decade since their HS graduation. Both are 28 year-olds by now and he called her ''a pathetic loser'' and was unremorseful? What type of person still bullies you at that age?
What type of person still bullies when they're 25 years and older?
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