Level playing field?

How things have turned round - fifty or sixty years ago it was commonplace to see signs advertising rooms to let specifying "whites only" or "no blacks or Irish" and suchlike.  All very illegal now of course.  But what's happening these days?  Signs are starting to appear saying "muslims only" or "asians only" and similar.  Is this not illegal?  Yes it is, but of course you have to tread carefully nowadays to avoid being accused of racism or Islamophobia.  So it seems to be in danger of turning into a "one law for us and another for them" situation.