Artem is an unhappy kid his parents get divorced he's mother have other men (and he life with they) but if he can't change his customs, behaviour etc. it's good idea to block him on list of servers (as host and as client) but he of course can still hack servers by e.g. ask someone who like him for an IP. The best way is download firewall and block his IP prefix 94.(I don't remember the rest).*.* , in my firewall it is Ip range 94.181.1.1:94.181.255.255 and to someone who doesn't know ip *.*.*.257 doesn't exist :P