Dean,
DaveH does not qualify as a false teacher because to be a false teacher
he would have had to have known the truth at one time, Jude calls them
"doubly dead" which means they would have to have been born again and
then turned away from the truth to apostasy and fables.
We don't need to fear DaveH or the deceiving spirits working in/with him
because the 'greater' one is in us. When the disciples pointed this kind of
thing out to Jesus He said "Let them alone, they be blind leaders of the blind"
Matt 15:14.
Dean writes:
And what do you take the words"Let them alone" to mean? Love them and invite them to you house- or stay away from them?