I'm going to assume this statement was meant as a rhetorical device, because on its own it's clearly ridiculous. Of course the internet puts ideas into people's heads.
More generally, while I understand the point you're making, I think you're underestimating the influence of a community on the behaviour of its members. I would say that by far the most significant factor causing people to be dicks on the internet are communities that normalise that kind of behaviour. People see others criticising "hipsters" and they are taught that this behaviour is accepted and even encouraged. Many of these people would be offended by the same behaviour in real life, and not even notice the hypocrisy.
I'm going to assume this statement was meant as a rhetorical device, because on its own it's clearly ridiculous. Of course the internet puts ideas into people's heads.
More generally, while I understand the point you're making, I think you're underestimating the influence of a community on the behaviour of its members. I would say that by far the most significant factor causing people to be dicks on the internet are communities that normalise that kind of behaviour. People see others criticising "hipsters" and they are taught that this behaviour is accepted and even encouraged. Many of these people would be offended by the same behaviour in real life, and not even notice the hypocrisy.