Gf made fun of someone who didn’t have a car

We’re both 21 and in college. We’ve been together for a year. Yesterday I was driving with her and she saw her “friends ex-fling” and started making fun of him for riding a bike. She went on to basically call him a bum and wonder why he didn’t have a car. I laughed along but inside felt disgusted as it was totally understandable for a college student—or anyone for that matter—to not be able to afford a car. In my opinion what makes the situation worse is my gf herself drives a car her parents passed down to her and she did not have to pay for. She comes from a very wealthy family and is a bit spoiled but I never thought she would say something so out of touch and mean. We have a great relationship and she’s a great gf but this is making me feel really uncomfortable.