Sadly, dA is filled with such people and drama nowadays. The most recent situation I recall (and a really ridiculous one) was when I stumbled upon two girls, apparently around the age of 16, arguing how one ripped off another's art just because the characters both had a green scarf. The pose and drawings were a bit similar, but visually not ripped off one another, it was just this type of similarity you get when two people who are only beginning their artistic journey draw something - early drawings all look simple and similar to another.
I decided to comment and simply pointed out the fact that one cannot copyright a freakin scarf, and I had a whole journal made about me how I'm mean and how an artist like me should be supportive of others and not hurt them (how did I hurt anyone?

)
Of course a whole herd of white knights followed and I had really, really mean comments written about me (although no one put up my name officially there, I was just called "this mean person"). Like, seriously, is "go kill yourself" a normal thing to say to one another when you're irritated? Well let's not mention all the comments going that "lol this person sure knows nothing about art" or "I bet they can't draw at all and are just jelous" (and how that one even happened? XD). I decided to give it a go and posted a comment "yeah, it was me, I'm not ashamed of what I said and I stick by my opinion" to see how they would react. STRANGELY no one attacked me, maybe they saw I actually know what I speak of?
I got blocked after that by that crybaby. I mean, I don't even care and it's more hilarious than stressing, but why make war over such a tiny issue?
Getting apart from this sort of drama (which tends to happen all the time and goes on and on) what really killed Deviantart for me is the revamp and getting rid of the "Today" page, and deleting the Daily deviations from the site's footer. It was the worst decision they could have made and everything went downhill from that point on. Back then a DD meant much, it was an honour and it really helped showcase good art. Now it's good for nothing. I've seen DD's getting less than 100 faves if they are LUCKY. Tons of great art just lie there unappreciated.