These days on Wechat several postings on reported incidents where foreigners are being attacked in Beijing by a group of Chinese men and beaten up. Several locations are mentioned. Attacks seem to occur if the foreigner is accompanied “by Chinese or Mongolian girl”.
Those “rumors” are not new and we have had a case of an American intern being beaten up on the street, for no reason, years ago. He left China the next day.
I would recommend, if those things happen, to file a police report and insist they check the CCTV cameras on the street. They are installed a bit everywhere.
It would be interesting to know in how far this is happening. And the police should seriously look into this, to check in how far those incidents happen, and why.