Probably nothing. Looks good to me, they speak your language, have jobs (don't abuse welfare), pay taxes, live legally. Reading about the party it seemed that they want to kick out people far from what you described (which can be still wrong, idk, but I'm not sure it's so outrageous I would boycott a business over its owner's preference). If they campaign to kick out people who are like what you described then I would think harder.

One note: I didn't say anything about the language they speak, and what language other people speak is none of my business.