You're labelling.
I do believe the EU is a net benefit, but it's also a system completely designed for international capitalism with no awareness for indigenous values. If every EU citizen has the right to migrate to the UK (and stay as long as they get a job within a certain period of time) then those people aren't easily integrating. The last time Great Britain had such a relative influx of people was probably 1066 and its aftermath. Think about it, it's been almost 1000 years... Furthermore, in the last significant migration before the Normans, Celtic culture and language was completely destroyed in England except for Cornwall (though it remains quite significant in the gene pool).
Places like the Netherlands don't get as many EU migrants, either in relative or absolute terms, so that there's no equivalent and you develop this feeling that you can preach that....
https://fullfact.org/immigration/eu-migration-and-uk/
....is normal. Well it's not normal and almost no other sovereign state on Earth is unable to maintain its own immigration policy, except for those in the EU and EEA. Don't expect non-EU migration to increase either.