To summarize the myriad of homework meta questions that dmckee linked to, as well as to editorialize a little, I think the issue that most of us have is with no-effort homework questions.
There is a help page on the main Physics.SE site that includes an explanation of what's considered on topic. That page briefly states that homework questions are off-topic, and then links to this more detailed meta post about what constitutes an acceptable homework question. Also, when you create a Physics.SE account, you have the option to take a very brief tour of the site, and IIRC it at least covers that list of what is on topic. As a result, if users aren't following the guidelines of what's on-topic, it's because they are ignoring information that was easily put in their reach.
Believe it or not, some of the best questions I've seen on this site have been tagged "homework-and-exercises", but they need to be asked the right way. In general, the two-prong test is that the question has to boil down to a specific conceptual question that would also be helpful to other uses, and the question has to include any attempted work. However, there are a lot of questions on here where the question text is just the homework question with no additional information or input from the user. On the other hand, other askers will ask their question, and then punctuate it with a "Due tomorrow" or "Show all work". This isn't just oblivious to the rules of the site, it's selfish and imposing. In the real world, all of these students will either continue in higher education or enter the world of work, and a life lesson that they should learn as soon as possible is that oftentimes, people want to help you (otherwise we wouldn't answer questions on here in the first place) but you have to be willing to put in the work yourself. The reality, it's academically dishonest for us to just do a kid's homework for him, who will no doubt claim it as his/her own. Additionally, students will likely get more out of the process of asking a question if they first spend some time analyzing what exactly they aren't understanding about a problem.
tl;dr: We welcome good homework questions here, but they have to follow certain guidelines, both for the good of the community and the OP. We hope you stick around to contribute to the site, but hopefully the more truly atrocious homework questions you see, the more you'll understand why there have to be guidelines in place.