It's nearly universal parlance in the USA to call MMS and SMS 'texts'. They are shown and treated as the same thing by the phone OS. I wouldn't expect the average layperson to even know there's a difference.
I'm honestly surprised that's not the case everywhere. Do you distinguish SMS and MMS in casual conversation?
I just moved to the USA from Europe and have found sms/mms to be annoying. I'm consistently missing texts especially mms. Maybe my settings are slightly off or the payload is exceeding MMS size limits but it's way less reliable than Whatsapp. Everyone seems to use iPhones so they don't hit this issue until they text an android user like me.
Afaik nobody uses MMS in central Europe. Depending on the carrier it is not even supported anymore, and has been very expensive before that. Virtually everyone switched to Whatsapp ten years ago.
I'm honestly surprised that's not the case everywhere. Do you distinguish SMS and MMS in casual conversation?