I grew up in the 60s-70s, in a very racist area. Pro-National Front and racist graffiti were everywhere. Everyday racism was commonplace. That's not the case any more, and I haven't seen any racist graffiti for decades.
If OP had asked this question a few years ago, I'd have said "not very racist at all". But I think things have changed. The far right seems to have more of a sense of legitimacy and I often see racist comments on news websites. I think we now have a climate where racism is not considered beyond the pale like it used to be.
It's hard to know though. I work in an organisation that is shit hot on all diversity issues and incredibly tolerant of people's differences. My friends are all lefty-liberal and anti-discrimination.
Consequently, I was shocked and horrified when I met one of DP's BIL's 8 years ago and he openly made racist (and sexist, Islamophobic and homophobic) comments and jokes, and we were all expected to laugh. I found it impossible not to call him out on it. It often led to a full-on argument and DP's sister in tears. Now, when there are whole-family events, we find out what time they're going and keep the overlap to a minimum. At the annual pre-Christmas lunch, we sit at opposite ends of the table.
I used to be involved with anti-racist groups in my politically active days, and honestly thought that that battle had been won. It really distresses and depresses me.