If you dont want to get private chats, you could always ignore them using:
Privates: /ignore -p *!*@*
Notices: /ignore -n *!*@*
DCCs (all): /ignore -d *!*@*
Combinations: /ignore -pnd *!*@* (would ignore priivates, notices and dccs - these (ignore flags) can be completely changed around and used in ANY combination)