Exposing an incel and pred

A guy i was talking to (20) was flirting and being suggestive to a girl who just turned 16. I just found out that he was also saying weird shit about women and speaking on them negatively. The problem is he keeps moving to new accounts and will probably just continue doing that with no remorse. Any tips or advice on how to deal with this? I don't want him to get away with no consequences for his actions.