European society heavily marginalizes racism, racists, nationalists, and similar things to the point where they're not just frowned upon, but cause hassle. Being called a racist hurts deeply people's feelings, and can cause people to distance themselves from others; mere accusations of it can lead to suspension, job loss, and even loss of friends.
Anti-racist behaviour is strangely tolerated; for example, on a bus route near where I used to live, the graffiti "KILL ALL THE BNP SUPPORTERS THEY ARE SCUM" was spraypainted to the wall of a bridge, visible to all buses which go that way; it's been there over 10 years. When I last got on a bus and went that way, last year, it was still there. To this day, no member of the police can support the BNP, and if you're found out, your job is gone. While I definitely understand this and I do sympathise with it... the BNP, like them or loathe them, are a legally recognised political party. Unfortunately. As much as I loathe BNP, I loathe restricting freedom of association to legal political parties more.
There is also a somewhat widespread idea that one simply can't be racist to the natives, even if ethnic minority groups are in the majority.
I speak from experience: in my class in college, there were almost 40 people. There were about 7 non-Asians (only one of whom in our class was black, who changed classes). We were frequently called a 'gora kutta' or 'gori kutti' (a "white dog", or "white *****" in Hindi-Urdu/Punjabi), and some other ones which include 'dirty white ********', 'mother-******* white untouchables', and so on. When we occasionally complained, teachers would tell us to stop being stupid, sit down, and shut up, even when it was explained that we knew what it meant, we were told to stop making a scene and not to come to the teacher complaining of vulgar trivialities. When a few of the white students tried to push it further, they were warned for being racist.
So, some groups and people will use cries of racism to get their own way. Racism is frequently used as a way of silencing opposition and keeping people in line and getting them to shut up. It can be used very loosely. People will claim racism if, for example, you weren't attracted to black people. To me, this makes about as much sense as someone being considered homophobic because they're not attracted to men. It also happens if you say you disagree with sharia law, or even reject certain cultural elements of a particular group.