Using the phrase ‘valid concerns about immigration’ today is a little bit like waving a St. George’s cross in the 80’s though. I mean, it can be done with the purest of intentions, but you’re using a symbol that people (taking you at your read) you’d rather not be associated with use to identify each other.
It’s up to you. You could add context to those concerns, you could tweak the phrasing, you could undertake a heroic quest to reclaim the phrase if you want.
I’m just adding some context as to why some people react to the phrase.