You're active and a great guy!
I have three stages:
-Warning: I would simply just tell them politely to stop. I give three.
-Mute/Gag: Should they continue after the three warnings, I would mute or gag them, depending on their methods.
-Note and Kick: If they continue afterwards, I will make a note of their name and steam ID then kick them
When someone is being disrespectful, then simply just gag if it's voicechat or mute them if it's textchat, and then give them a warning. I always start by giving them a verbally warning, but you don't give them three warnings.
Anyway you have a nice application so it's a