Earlier quoted context omitted.
You can't do group chats in the same way using SMS messages. People who receive an SMS have no idea who else the message was sent to, so they can't even "reply all".
The person you're replying to probably meant MMS which can be used for group texting as you're describing.
Did you know that MMS can transmit slideshows[1]? I didn't, until my father somehow sent me one. The UI that Android has for that is — naturally — a complete afterthought. (No way to pause the slideshow, no way to navigate the slides, nothing. Just one run through the animation at Warp 8.)
[1]: https://en.wikipedia.org/wiki/Multimedia_Messaging_Service