I have a story to add to this forum, to which my response has been 'Complete Silence'. I have literally blanked this person from my life.
Rewind to 5 years ago when I met my Husband's extended family for the first time one Christmas. I made an effort to be polite and nice to everyone, and I thought everything went well. I met one of Hubby's cousins who (at the time) was a bit of a 'Hells Angel' Motorcycle-gang-wannabe type (dressed like it, but didn't have a bike or belong to a group). This was an adult man in his 40's who struggled to hold down a job, had a bit of a drug issue but didn't care. He was happy living his life in whatever way he chose.
I found him intimidating, and he made me a bit nervous. I tend to gabble a bit when I'm nervous but I thought overall I'd made a positive introduction to him.
When I saw him at family events over the next couple of years, I was always polite, despite finding him incredibly intimidating. I thought we got on relatively well (considering he's a rarely-seen cousin of my husband's). He seemed friendly enough to me so I was good with that. We didn't exactly speak often, nor for any great length. We literally just chatted in passing really.
Fast forward to a year or so ago and my Husband's Father passed away due to complications with a long-term illness.
My Husband and his family were devastated, so myself and my Sister-in-Law (we both 'married in') rallied 'round and, as was appropriate, joined MIL, BIL and Husband in the front row as 'immediate family'.
In the intervening time between when I had last seen 'Hells Angel Cousin' and the funeral, he had met a woman and married in a private ceremony to which no-one but his immediate Aunts (inc MIL) were invited.
It just so happened that to support Husband, my own family attended the funeral of FIL, and it just so happened that they were sat in the row in front of Hells Angel Cousin and his new wife.
The following was relayed to me privately after the ceremony:
Apparently, New Wife had asked Hells Angel Cousin who everyone was, specifically the immediate family of the deceased. Hells Angel Cousin proceeded to tell this woman (who none of us bar MIL had ever met), that Husband and BIL were his cousins, MIL was his Aunt, and SIL was BIL's wife. When she asked about me, he apparently said "Oh, that's Ven, (Hubby's) partner. She's a bit of a motormouth."
He did not feel the need to add descriptive qualifiers to any of the OTHER introductions. Just me. At my FIL's funeral. Loud enough for my own family (and all those around them) to hear. He humiliated me in front of assembled relations - most of whom I had never met as many had travelled a long way to attend FIL's funeral.
I chose to take no action at the wake, but a few weeks later when my Husband was feeling less raw, I relayed the story and informed him in no uncertain terms that Hells Angel Cousin is not, nor will ever be, welcome at any of our events.
I don't know if I'm 'giving him the cut direct' or simply Ghosting him out of our lives, but I've chosen not to respond to his rudeness and am treating it with silent contempt.
I told MIL about it and she told her sister (Hells Angels' mother) who apparently agreed with me that her son was out of order.
So now we pretend he doesn't exist.