Buyer’s agent sabotaging my home sale. Is this legal?

Here’s our situation. We interviewed a few real estate agents and didn’t like any of them. We’re in a very rural area so didn’t have a lot of options. They were unprofessional and hard to communicate. Their other listings looked horrible.

So we decided to sell it on our own, took professional pictures and put it on the market with flat fee MLS service. We figured 1% is enough for buyer’s agent’s work (especially with recent lawsuit and change) We got a lot of saves and views on Zillow and Realtor but got no contacts. We were curious to see how buyers would reach us so we requested a showing on Zillow. Got connected to a local agent. And here’s what happened:

He said he will get back to me after some research. He texted me saying “I have concerns about the property and don’t recommend it. Are you interested in any other property?” So we called as a “buyer” and asked him what the problem was. He basically told us that “The seller is a greedy scam artist who cares only about keeping all money to himself. Even his listing is sketchy with no seller’s agent. It’s a red flag.” Then he goes on the rant “I’m going be on welfare and won’t be able to pay for fuel…. Well I drive a diesel car and it’s expensive. We will have to negotiate the price and you can make up for the lost money for me. Or I will change the contact right before closing and I will make them sign it…. If you REALLY want to see it, I guess we could see but I don’t see the reason”

Whoa. We simply wanted to see if it works because we were nervous about doing it by ourselves but this was much more than that. He was sabotaging the deal and stopping a potential buyer from even looking at the house. Only because he’a angry about getting only 1%. So now, I’m worried if other real estate agents are doing this and if this guy is going to keep cutting people off this way. We’re in a small rural town so I wonder if we’re going to be bullied by these agents in the area. We already changed the fee structure to 2.5% but isn’t it illegal for a real estate agent to do this? Isn’t this what they were sued for recently?

I really want this guy to not take any potential buyers contacts and stop sabotaging the sale. Is there anything I can do to protect myself as a seller?