Laymans suggestions/ramblings :
I wonder what impact even a routine complaint to the bar has--surely lots of people have beefs about something a lawyer supposedly did.?
How does the Bar get involved in some nonattorney activities espcially where there is no attorney client relationship. If you are both an attorney and operate a auto garage , how does a complaint about how well you repaired a guys transmission belong before the Bar? Now if you sue the car owner for not paying his auto repair bill I as a layperson could see a gray area as to roles.
1. To engage in a mudfight with a pig only makes the pig happy? And you get covered with mud?
Sometimes to do nothing is best response?
2 People have a pretty broad right to complain and short of being able to prove libel or slander I suspect its a cost of living in a free society.
3. In some circles to be a "landlord" is to be a bad guy even before you do a thing. (Been there)
4. I'm short on good ways to recover either your costs or time value or your reputation.
5. IF the antagonist has an income or asset base of any size that is not well protected/judgement proof AND he has made untrue accusations of supposed criminal activities to anyone by but proper law enforcement authority , you might want to revisit a libel/slander suit with somebody skilled at such litigation.
6. Personally, just my own view, I would not want to take on a lawyer on his own ballfield , even if your expertise is patent law, you probably know 10X more about war games and court rules than I do and/or you can call in favors/barter with other pro's for suggestions 100X better than I can