Yes, certainly. Disruptive behaviors can be problematic and ruin the experience of every other participant present in the chat. Unlimited "freedom" of speech is open to deviances, let alone approved by Twitter. As a host, one of your responsibilities is also to act as a moderator by ensuring a civil ambiance. We suggest you try first to warn the deviant individual(s). You can either call them out within the chat or send them a private message. If this doesn't work, you can tap on their avatar and select either "Block and remove" or "Report and remove".