What's the proper etiquette when waiting for a table at a restaurant with friends?

We had a group of friends scheduled to meet up at a restaurant around 7:00pm for drinks and dinner. I showed up first around 6:45pm to put our group name in (previously had tried calling, however they couldn’t take reservations for a party our size). I was told it would be an hour and a half wait until we get a table.

At 7:00pm, one of the friends arrive with his girlfriend and I tell them that I was told it would be an hour and a half wait. The friend responded to me, “Oh, well then we’re going to go pick something up at the mall, give me a text if you guys get seated before we get back” And I reply “What? Why?” and the GF says “Well its an hour and a half wait” which gave me the impression that they considered their time more valuable than ours (why should they wait since we were going to have to be waiting there anyway).

Now this is a restaurant where you can simply go to the bar order a drink and stand around and wait for your table, so I thought it would be courteous to simply all wait as a group.

I consider their actions disrepectful and the tone they replied to me with rathy snarky with a condescending undertone. But maybe I read it wrong.

Am I out of line thinking that they simply acted rude? They don’t think there was anything wrong with it since we were waiting there anyway.

Thoughts?