I think that was to me.
In your OP you said that he said thay his family said that they were "very very pleased they were staying in the EU" Then about the German government welcoming refugees. Leaving aside the "unlike us" additions. Yes, both do infer a certain political leaning of his family. I used the word parent because yes I did make an assumption that those comments came from parents, not extended family or siblings. fair enought if he was recounting what his sister, grandfather, aunt said. That's not the point anyway.
Would you be telling us that your exchange student told you those same things about what his family said, if his family were more far right?
No, they would be different. I'm a massive remoaner by they way.
As an aside, his parents couldn't say anything themselves unless they were there. It's just stuff passed on in conversation between the host family and an interested exchange student. He's probably working on an end of term paper or something ;)
If in your Op, you said an exchange student said some things to me and I think we could all learn a thing or two from other countries, well you would have had many people going Yes Of Course. Blow me down with a feather, if there aren't many groups in the UK campaigining fighting and putting ideas forward. Join one. Vote in your local elections. When you next notice an estate being built locally, campaign that they should be built to be green etc.
Your OP was we had an exchange student
He spoke about Vegan and Vegetarian. Yes, good language skills. Probably a good practice conversational topic for a spoken examination. Unless he was a vegetarian, or you are?
He said some stuff about building qualtity. Yup, ok.
He said his family are happy to be in the EU. The next statement read that it was his family who were also happy to welcome refugees but it could also be that he though that Germany was more open.
But due to the above conversation you now you feel like the UK is a bit crap and depressing 