It makes me uncomfortable when my husband hangs out with this guy

My husband has a friend named Mason who he's been friends with since they were 13. Mason is just the worst in my opinion. A huge womanizer. He's constantly posting with girls on his Instagram and constantly dating girls and then cheating on the girls he's dating. He constantly brags about how many "bitches" he fucks. His last girlfriend got into a car accident and had a broken leg and he fucked a girl in their bed. My husband constantly says he doesn't agree with his behavior but they've been friends so long. Mason is also a trauma dumper. Especially when he's drunk. When they were 18 he randomly dumped on my husband that he was raped when he was 14. When we had a New Year's party a couple years ago he got drunk and trauam dumped and didn't just trauma dump. He went into graphic detail of his "gang rape" and made us all uncomfortable. There were a lot of women at our party who have SA trauma and his friend just lacks so much awareness on how going into detail about a gang rape can be triggering to them. But he's living proof a man will do anything except go to therapy. My husband instead of coming home texted me that he's stopping by Mason's to smoke a little weed for a bit. I hate Mason and that he's friends with him. I've went and found proof that Mason isn't the best friend. When he had me hold his phone I saw text messages on Mason's phone with him talking crap about my husband and told him. My husband said Mason can love you one minute be pissed the next. He doesn't take it personally. Mason was talking shit because my husband was gaming with someone else when he promised to game with Mason that day. Even though Mason was talking shit my husband isn't bothered by it. Mason has gotten mad before about my husband not keeping his promise to game with him and my husband just says "I'm getting on ya damn cry baby. We can play a game together okay." Like it's like he babies this friend sometimes. I've expressed time and time again about my feelings and my husband seems to have no intention of dropping Mason.