Hi, according to me, we must try to sort out our own issues first, so take this as an opportunity to discuss with the person directly. Tell them that you are interested in speaking to them after you finish with one, genuinely give time to that person in private listen what they have to say and reply as a professional. If comments are not acceptable inform them openly, positively give basic etiquette info. If act persist more than two times than consult your HR.
In most of my cases it worked, infact it helped me in securing better place and recognition.
Best Regards.