In this particular case it's specific resentment. I don't like it when people create websites that do nothing more than present content they've taken from other sites without permission in return for ad revenue.
I'm sorry, but from the screenshot another commentor posted, it clearly shows that this person had advertising on their blog. That shows clear intent of monetizing the blog and generating revenue. They might not have made much revenue from the ads, but they still showed intent to.
Its not the copyright, its the chilling effect of not visible copyright. This encasing of the whole web and everything on it with a invisible alarm-field for the users.
You may not send radiowaves. You may not distill your own alcohol, you may not do this, you may not do that. Let the professionals handle it. This is where some self-important case like the Taxi-drivers starts to enshrine a often trivial task to demand entry dutys and guild taxes.
I want you to clearly sign your content - so that is unreusable and nobody gets put out in the court to statuate a exemple, so that a useless caste of professinal may life from the fear of the comoners.
> I work hard on my hobby, but i do not feel entitled too money for it.
It's not that simple. What is just a hobby for you might be a source of income for someone else. You can't turn tables around and say they can't make money only because you don't expect a payment for your hobby.
I will give you an example. There are two people creating code, both working hard. One creates closed software, the other is creating open source. They both spend hundreds of hours on their projects. Imagine someone steals the closed source program and posts it on the web. Would you then talk about minefield, fences and living in constant fear? This simply makes no sense.
Before using an image for anything, I always check its license. It's so easy nowadays! Filtering by license is now part of Google Image search, so you don't even have to visit specialized sites like in the old days. Everything someone created is copyrighted and you can't just use it as you want, unless the creator allows you to - and many people do. It's so simple. They should teach these things early at school so we wouldn't have problems like the owner of the website in question.