Behaviour such as?

First of all, a lot of people are trolls; for example, there's a lot of them on 4chan, especially on pol, and most of them are thought as 'alt-right' in the media. However, a lot of them are just trolls; not alt-right, and if you've seen some of the pics from their meet ups, you'd see about half of them is white, the rest not.

Personally, I don't mind trolls. They are fairly easy to deal with throughout most of the internet, and they get banned over it if they are breaking rules or insulting people deliberately. Same stands for SJWs, though at some places rules for them are a bit more 'lax', so to speak. Regardless, I'd support them being able to say whatever they want, even if I disagree with it.

Furthermore, it's those people - SJWs, as some refer to them, though, eh - that want the anonymity gone. You don't have to look past real life to see what they think of free speech, really. It's feminists like this: https://www.theguardian.com/commentisfree/2015/sep/10/end-online-comments that want to restrict speech (and let's be clear, 99% of things she mentions is handled by mods). It's in England and Germany they are arresting people over 'hate speech', and pretty sure same thing happened in Sweden for 80-something year old woman (or 60-something?). Fuck that. Hell, don't have to go past places such as SRS, Gamer Ghazi, or other similar subs where you get banned for asking questions, or some other subs if you comment in 'bad subs' such as TIA here (pretty sure they still ban over it in r/offmychest, and probably some more). It's not alt-right people that are making up lists of 'bad people', or 'bad users' and trying to block them, or mark them, so those using such lists know who they are, and where they've posted (not that I'm defending alt-right, but seriously).

Trolls can be ignored; if you can't handle it (and I don't mean you, but in general) log off, or change the place you frequent. There's no doubt some of the worse forms exist; such as cyberbullying, but most of it can be handled, and in fact, prevented - by teaching people not to share their information as freely as they do. Those that try (or do) inflict some harm, they tend to get tracked down and punished.