I think people pick on js more because it's the only option for scripting frontend for the web, while if you don't like python there's probably another language that can be used instead.
I'd say people pick on JS because they don't learn it. They jump in, use it like python or C++, get frustrated it's not the same as what they're used to, vow to use it as little as possible. This was especially true before es5/es6 with var function scope and no class syntax.
