How can I stop Mountain Lion from auto-connecting to AppleTVs in my network?

Ever since upgrading to Mountain Lion my MacBook Pro automatically tries to connect to any AppleTV in the network I'm on. This is great for at home, but my office has a few different AppleTVs that are constantly sucking my audio through without any type of direction to do so on my end.
Thank you for your help.

I don´t know for a fact, but I guess you can have your firewall block the traffic to and from the AppleTV's. You have to find out which ports to block (see: http://bowersandwilkins.custhelp.com/app/answers/detail/a_id/55/~/firewall-ports -utilised-by-airplay ) and also you will need to have different location profiles for your home and work network.
Just my two cents.

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