When do you stop ignoring fans?

[JefferMC]

Had a situation at a recent tournament...

R1 on 3B, R2 on 2B. Batter hits towards SS, SS is set up behind the baseline and moves sideways to field the ball. R2 passes in front of the SS, who then misses the ball. R3 crosses home, R2 reaches 3B, and BR is safe at 1B. No call from either ump.

DC comes out of the dugout looking for interference. I wasn't paying close attention so I don't know exactly which ump he approached first, etc. However, the gist of the situation is that the plate ump called interference on R2, put R3 and R2 back on base and called the batter-runner out. The OC then came out to discuss the situation and one of the offensive team's fans started complaining. In what should have been the end of it, the BR was returned to 1B and R2 was taken off of 2B and sent to the dugout.

However, said fan kept loudly complaining (from the stands beyond the 1B dugout, about at 1B) that it was a bad call, it wasn't the PU's call, he shouldn't have reversed the BU, etc. This went on for about a minute before the PU came out from behind the plate, removed his mask and told the fan that he made the call and the fan had to shut up. Then when the fan continued to make his argument he told him to leave the park. When the fan refused he told the coach to tell his fan to leave. After about 2 or 3 more minutes, this was accomplished.

Would you have engaged this fan? Why or why not?

[P.S. It's not germaine to this post, but R2 stated that the ball did hit her foot]