Anti-immigrant or anti-immigration? It's helpful to distinguish. The problem is with people who are anti-immigration because they are anti-immigrant.Apart from Bob K i am possibly the least 'anti-immigrant' member on here.
I've just had lunch (at a pavement table, brrr) with my French friend who reminded me of yet another EU immigrant creating jobs in Britain - Schreiber who built office furniture in the UK (and sent his English workers on trips to Germany to learn techniques). Is that the sort of immigrant / immigration people are against?