Sis me ganun talagang mga tao, yung first time nyo pa lang magkita, hostile na sayo. Though it's normal na me mga taong di magaan loob mo, pero at least we try to be civil and give the person a chance. For some people, they're very transparent with their dislike of a person, mahirap din i-judge. Maybe, iba yung environment na kinalakihan nila, they grew up not properly guided by their parents, or they had difficult childhood.
If you're at the receiving end of unexplained resentment, best thing to do is IGNORE! Try your best to appear unaffected, and all the more expand your circle of friends. Pag me verbal slurs na or "parinig" kung di naman diretsahan, ignore pa din. Pag talagang nag name-drop na, saka mo sya i=confront, but in a civil way pa din, and have someone beside you na nakakaintindi, as a witness.