Basically no matter what you make, there will always be someone out there who doesn't like it for whatever reason. Some people take things way too far, but I noticed the greatest amount of this anger tends to go, stuff that's overtly political aside, towards popular established series and fanart (at least from what I've seen on tumblr), so... Honestly I think it looks like a bigger issue than it actually is? If your comic or novel gets political then yeah, there will be a lot of anger from people disagreeing... But if you're just making something for funsies or just to tell a story without including hot-button issues, the grand majority of people reading it probably aren't going to make a callout post about something that's ultimately harmless. And if they do, then I guess they just got way too much time on their hands.
In general, it's a good idea not to put out too much personal info on the 'net, but as far as I can tell, you probably don't have too much to worry about. If people harrass you, you can block them (unless you're on webtoons, I really hope they fix that at some point).