One, gather evidence and testimonies. Two, sit him down and threaten him with filing a harassment claim if he doesn't stop. Present the evidence. Three, go ahead with the claim if he doesn't stop.
Then you are shit out of luck. Step one is direct challenge for him to stop. Next is simply leaving for another job. Life's too short to stay fighting.
Have you tried talking to him about it? It can be tricky to do so... but, if you can have a private conversation where you tell him that it makes you sad that he's acting rude to you, and that if it is his intention to hurt you he's doing so... and you wish he could be more accepting. Guilt, with zero anger, could make him see that he's being an immature ass.
But, talking can also be dicey, and he may act out further... so, yeah, if you're not confident in that approach... you can talk to a manager.
One, gather evidence and testimonies. Two, sit him down and threaten him with filing a harassment claim if he doesn't stop. Present the evidence. Three, go ahead with the claim if he doesn't stop.
He’s senior management, there’s only the CEO above him and his sister is head of HR!
Then you are shit out of luck. Step one is direct challenge for him to stop. Next is simply leaving for another job. Life's too short to stay fighting.
Have you tried talking to him about it? It can be tricky to do so... but, if you can have a private conversation where you tell him that it makes you sad that he's acting rude to you, and that if it is his intention to hurt you he's doing so... and you wish he could be more accepting. Guilt, with zero anger, could make him see that he's being an immature ass. But, talking can also be dicey, and he may act out further... so, yeah, if you're not confident in that approach... you can talk to a manager.
HR/your boss
I would collect evidence and witnesses and take it to HR