No, and yes
No, this phenomenon is widely known in every land, and even from the ancient times. In Indonesia there is a saying that roughly translate to "empty barrel sounds loudest", and "ripple in the water means it is shallow", which means people who do the most talk, mostly do the least.
In this article (I believe there is older research, but I can't find it), the title says it all "Self-Proclaimed Experts More Vulnerable to the Illusion of Knowledge".
Why? Because they think they're full and refuse to accept more knowledge. There is even a Chinese saying for that. They think they're smart, and an expert who must be right.
Yes, because this is worsened by the revolution of information distribution. If mail arrives days or even weeks, now internet allow the exchange of information and knowledge in seconds. People can self-learn many topics in short time, but without experience in the field. This led to the cup "filled" so quickly, while in reality they have just a drip of the knowledge of the topic.
Don't forget that the internet allow people to communicate easily, and in that sense, argue over a topic easily. Internet also allow people to view people arguments publicly over social media (twitter war, anyone?). Some people actually love arguing openly because they want the sense of dominating the other party, but this topic is for another question.