Some times it is a personality conflict.
You may be dealing with someone with an ego problem that just decided they don't like your success and you should kiss you know what so then can help you and keep their big head inflated.
othertimes you could be dealing with a persons mood swings as bi polar.
Smile on em, thank on en, and PXXX on em.
the sea is full of good places to work.
Best,
Bebop with 60 years experience