Banned a member from my forum

So, I have a free op server like this one with similar forums and I have a permban list on the forums too. It had shown the IP addresses of the users who were permbanned. One member who was new reported my post because he claimed the Ip's were shown without the users consent, including his (he was server permbanned). He also said in my shoutbox that he wanted the ip's to be removed or he would 'take action.' Now at first, I just sent him a PM telling him not to use the phrase 'take action' in such vague a manner, as I slightly percieved it as a threat. Later, I just decided to forum ban him due to complications (he also bypassed a permban on-server) and it was because I felt a bit unsafe. Hopefully, I made the right choice for the safety of my forums. However, i'm not sure if he might do something really bad now that he's forum banned...


(I actually did remove the IPS btw)