Studying abroad in the UK, I was teased by classmates for wasting my time on trivial matters.

I just finished tidying up my room, finished studying and was about to play on my phone before going to sleep when I chatted with my university classmates in the group. They all knew I was studying abroad and asked me how the environment was over there. We talked for about ten minutes when suddenly a male classmate said, "Isn't it because you couldn't get into a domestic university that you went abroad? You still won't be able to find a job." The atmosphere suddenly cooled down. My sisters saw that something was wrong and changed the topic, but this sentence really made me so angry that I couldn't sleep. I want to ask what can be done to shut him up? Finally, I wish everyone happiness and good luck.