I R a realtor, I own the largest real estate marketing team in my Region.
I won't get into all the BS posted about realtors here, as it does apply to 99%, and some even applies to me directly. (over paid part)
Sounds like you're willing to "stir the pot" a little?
List it with clear instructions that this dude is excluded from all transactions.
Your the seller, you make the rules. Period.
BTW, one of the reasons that I'm such a good realtor is because I dealt with the Bustards for over 20 years before becoming one; I tell my staff realtors, "I don't like realtors". I consider myself a marketing expert and focus on 'earning' my income. I've sold FSBO's to clients for zero commission, so WTF? Client needs always come first in my business, in the end, I'm paid very well.
I often list properties on both MLS and FSBO sites to get all the action I can. MLS beats FSBO 1,000% for marketing coverage. List it on MLS for the right price and move on.
Good Luck, the local MLS gossip will be live and active with your listing! This kinda stuff spreads like wild fire. Ha, ha, I love it.