J.P.
Unmanaging a node only stops netmon's polling of the node. (pinging,
configuration and discovery polling)
Unmanaging does not stop reception of "unsolicited traps" that are sent
by the (unmanaged) node.
The only way to accomplish this is to write a ruleset that checks the
node status before processing the trap, If it is unmanaged, discard it.
Be careful though, you do not want to scan the database every time a
trap is received.
I would suggest using a collection to define those "unmanaged" nodes,
then check for collection membership before performing a database scan.

The other (better) option is to go to each node and remove NetView from
its Trap Destination configuration.

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