If you're being bullied in any way online, there are two immediate things you can do. One is to contact the owner of the sites involved and report it. The other, if the language used oversteps a mark, is to report to the police (in the UK). It is illegal to use the telephone and internet in the UK to harm, cause er or threaten.
However it seems that the bigger the site, the less heed is paid. So for example sites like Youtube are notorious for inaction. Also, some police forces are incapable of pursuing the simplest and most obvious crimes so might struggle with the concept of cyber abuse.
So, by far the most direct way to not experience the effects is to 'disappear'. Make yourself new online identities. I'm not saying this is fair or right, but it's the simplest way to protect oneself.
Lastly, electronic text of all kinds is notorious for not conveying subtelties of nuance. Someone might be making witty comments (in their view), and they come across as cutting or harsh.
Does this help?