Here the full scene of the incident:

ref goes to bench for sending off Başakşehir assistant Webo for protesting;
the fourth man points at him saying ‘negru’ (which is ‘black’ in Romanian);
Webo asking why he points at him as ‘negru’pic.twitter.com/z1JXMSOD1Y

— Tancredi Palmeri (@tancredipalmeri) December 8, 2020