He saw that his course mates that went to university just hung around with other Brits or Americans.
@Twizbe
Although native English speakers are known for this, not all of us did that. I kept quite quiet in the first few days of Uni life, making sure that not one word of English crossed my lips.
Joined lots of intros for clubs and societies, volunteered for the steering committee for the bar, so I had lots to talk about. By the time my fellow students clocked that I spoke other languages, they were used to speaking the local language and made no attempt to score free English lessons of me.
To your husband, who saw all native English speakers sticking with English , I hope I would have looked like a native 'local language speaker'.
I grew up in an English speaking international community where most English people were happy to not make the effort with other languages, so knew exactly what it takes to not get stuck ...
Just speak the language you want to speak, regardless how people reply. They soon give up. 😀
That approach will be as valid at Uni as in a work place, where there will often also be temptation to still with your own language. It's really not an argument between Uni and work.