LMAO!!!
Lets get something right, if someone says they can so call hack with there leet skills 80 % of them don't flaunt it, in this case we have another script kiddie trying to be k-rad. If he was honestly skilled with computers he wouldn't need to ask for your IP, he wouldn't ask you to turn off your firewall. If anything it would be more of a challenge to have the firewall on.
When people say they can hack it mostly falls under 3 area's ...
You have the white hat hackers ( good guys ) which basicly tell admins about there problems and how to fix it. they never destroy anything or delete it in the sake of sh*ts and giggles. They always help people they have computer problems.
You have black hat hackers ( bad guys ) which sometimes program viruses, trojans, flooders, etc sometimes delete anything and everything insight cause they don't have anything else better do to after they crack a site ( deface ), gain access to a computer remotely or what not.
You also have grey hat hackers ( not many ) which are alittle in between they help people out when they need it, but also can do evil at times to people that mess with them...
If anyone says they can hack most don't yap about it, which in this case anyone with computer knowledge can tell you that the ip 127.0.0.1 is a loop back to your own.
Saying you have a program that can kick people offline once they put your ip in would prolly be a DOS ( Denial of Service ) which would be sending Packets ( SYN , UDP , TCP , ICMP, etc ) to an ip causing your pc or hang , crash or your internet to fail...
Also, you can't send a virus to anyones computer especially if they have a firewall which has a IDS ( Intrusion Detection System ) if you would like to be even more safe try finding a VPN which is a ( Virtual Private Network ) its the samething as a firewall but its better. They can't delete C: drives or any drives remotely unless they have root access, To get root someone has to have an exploit on there pc or trojan. If someone's really L33T they will tell you there is a way to spoof there ip to cut in between your ISP and your IP ( Man in the middle Attack ) to recieve TCP ACK packets and send them back to your pc possibly with a packet sniffer and packet modifier to take control and get root access. which I would say less than 4 % of real hackers know how to do...