Hello mountainbnewb!
Thanks for using the Apple Support Communities. I see from your post that you are having trouble removing a non-iPhone user from a group conversation. I can definitely understand wanting to make sure that you can manage who receives what messages on your iPhone. I can definitely help shed some light on why this isn't working.
This is actually expected behavior. Check out this section of this great resource about group messaging called Send a group message on your iPhone, iPad, or iPod touch :
I hope this information is helpful for future reference.
Kindest Regards
Thanks for using the Apple Support Communities. I see from your post that you are having trouble removing a non-iPhone user from a group conversation. I can definitely understand wanting to make sure that you can manage who receives what messages on your iPhone. I can definitely help shed some light on why this isn't working.
This is actually expected behavior. Check out this section of this great resource about group messaging called Send a group message on your iPhone, iPad, or iPod touch :
Add or remove someone from a group conversation
Anyone in a group iMessage can add or remove someone from the conversation. You can remove a person from a group iMessage that has at least three other people. You can’t add or remove people from group MMS messages or group SMS messages.
I hope this information is helpful for future reference.
Kindest Regards