URGENT : I would like to urgently have a chat with a moderator regarding a user who over the course of the last months posts abusive, non helpful comments on my questions. I feel threatened right now and consider him a dangerous person for me personally. I contacted Stack Exchange support as well. Please, assist me as soon as you can. It would be much appreciated.

@Rebellos, the only comment that I can see (that your received in the time-frame of your plea) is to this question. And the comment there is helpful, in suggesting to you that your approach might be inefficient, or another approach exists. I'd never call such a question "threatening" or "dangerous". But you may be referring to other/different comments altogether.