I'm thinking of the person who kept interrupting me as I was speaking. I continued to speak and raise my voice over their own words.
Is this person interfering with your work or studies?
Yes, he interrupted me while I was having a very important conversation on the phone!
It's understandable to be offended when you're trying to speak to someone over the phone. Let the person know who was interrupting that you didn't appreciate their actions. Do so in a kind manner in order to not escalate the situation, but to inform them their behavior wasn't okay.
This is ridiculous; I use the opportunities to educate the public on issues that are not well-known.
You just need to talk to him. He might be totally unaware of his behavior and how inappropriate it is.