I also love sharing videos. But this is about the person that's absolutely obnoxious about it and keeps showing you videos without realizing that the other person isn't really interested.

I usually send the videos I want to share via messenger app. Then everybody can watch them when they want. And from their reaction I can read what kind of videos we both appreciate.

I do share videos in person, mostly when they are absolutely on topic and showing the video does not interrupt the conversation.