I understand what you are feeling. I had one DD chat where it seemed like there was one interruption or distraction or inappropriate behaviour after the other. I was reassured that it happens. I was reminded of my boot button and my position of LEADER gave me the right to use that and to warn and to make sure my chat was a safe place.
SOOOO-------I tip my hat to you for handling things--even tho I was only there for a little bit-----remind you that you are the leader and what you say goes.
I also offer my support at the next Thurs Chat. Please let me know how you would like me to support you there.