The internet allows people to do things online that they would never consider doing in real life. Thats just how it is, and has been for the last 20 odd years.
Using the internet doesn't mean you can abandon a common sense of decency & respect for others, the same that you show for people face to face. By saying "it's just the internet" you're giving them carte Blanche to portray the troll without consequence, you're condoning the troll & I ain't having that. These gutless wonders bully some people to the point... Well I don't need to spell it out.
You're entitled to your opinion but, I personally won't accept the troll as part of the internet experience.