Are people who do not speak english fluently not allowed here on SE-physics? (Since they may not be able to format properly or choose the clearest words). Usually i can understand what someone is talking about by context but ive seen complaints and closures.
What can we do if we are being harassed by another user(s)?
Ive come to notice some elitists and trolls that post comments not related to the physics question or ridicule others for asking a question they find elementary or uneccesarry.
About the language, I don't think there is a formal solution. In the end, if physics becomes a main discipline for you, you will be in need of learning better English so you can read papers and articles. On the trolling staff, just don't pay attention on the way a comment or a message is being phrased. Rather, consider if there is anything from that comment that might help you evolve. If it is completely irrelevant, ignore it.
Physics Stack Exchange runs in English, but that is not to exclude people for whom English is not a native tongue. When you see what appears to be someone struggling with the language you can (a) ask them if your re-phrasing is what they mean, or if you are fairly confident (b) simple edit (assuming you have that privilege) and make a comment to the effect that you have tried to improve the working and was that correct.
There are two aspirations at work here:
The users of Physics should be trying to make the question as good as they can.
The original poster should take the time to make their question as clear as possible, and actively interact with and support users who are trying to help improve the question.
These questions are more likely to get closed, but if they can be cleaned up they should be fairly easy to get re-opened as well.