My family is from a Commonwealth country. We're here because the British government asked us to be due to a skills shortage about 60 years ago. My grandad came here to work.
It was always drilled into us that we lived in a Christian country with certain customs. Yes, we could still eat food from our country and celebrate our own religion and festivals, BUT we were also brought up to celebrate Christian festivals as we lived here. Christmas is still the biggest occasion in our family.
My grandad and his family joined the local Working Mens Club and socialised with people from all walks of life, from when they got here to now. They taught us about their cultures and we learnt about theirs.
I was born here, but the attitude of my family and not sticking in close circles was what allowed me to do the same. I got bullied for it in school by the other brown girls btw, because my family didn't come from the same country as them and weren't traditional enough for their liking.
When I go abroad, I look up how to conduct myself in that country, according to their traditions.
It's not racist to expect people to behave like this, but to tar us all with the same brush and talk about "immigrant behaviour" as a collective, absolutely is. The UK ASKED my family to come here because they needed us. We didn't just waltz in because we felt like it, so this "too many immigrants" thing is a product of the UK's own actions. We're not all illegal.