I actually thought the second episode was markedly worse. Action was nonsensical, almost as bad as Zeb's subplot. "I hate guns! But only a specific type of guns! No, no, I get that we kill people by shooting them, and I stab them with the pointy end of my shock staff, and we occasionally blow people up, but this one type of gun is just too inhumane!"
The disruptors didn't commit genocide. He shouldn't be pissed off at the guns. Whatever pain inflicted upon somebody by one of those rifles, Zeb has done worse. We've seen what they do, which is shoot an electrical current through whatever they're fired at. Zeb runs around stabbing people with a shock staff. A SHOCK staff. And it's implied he greatly enjoys killing. This was not the right character to try and sympathize with on account of loss of life....Zeb's committed genocide?
Edit: More to the point, saying they're just powered up disruptors doesn't do us as much good with the EU shunted into Legends. In context, they were intended for taking down ships, but got used on organic beings instead, with the results implied to be quite horrific - enough for the Senate to make them illegal. What that actually means is up in the air. Could be it was just the equivalent of shooting bazookas into someone's face, could be it left them in agony and slowly dying. Could be it forced them to speak and act like Jar Jar Binks and the planet resultingly committed suicide to save face.