I haven't been harrassed, but I tend to play my multi-box army infrequently and try to play them at "off hours" and in areas that aren't busy. Worst I've ever gotten is people following me for a few minutes and "LOL" or "loser" before they give up and wander off. If someone asks me a question politely in /whisper I'll explain what I'm doing. Most of those people express encouragement or admiration and leave me alone from there.

There was one funny kid who told me that he was going to report me for "hacking". I told him to go right ahead. He was asking questions and I answered them, and I assumed he was gathering information for his report to a GM. After a series of questions I explained that I was running five accounts on two computers, and this seemed to confuse him.

It turns out that he thought I was using software to hack a single account and allow five characters on that account to play, and the information he was seeking was so that he could download the software and hack as well. He appeared to be rather crestfallen at seeing his chance to bot an illegal army of gnomes fade away. I had a good laugh when I realized what he was really after.