<human>: Original post here: 

I took your advice, reddit, and I told my boyfriend about his friends talking shit about me. It's weird, but he wasn't fazed at all by it, like at all. In his words, he said "That's just Mike being Mike". When I pressed him for more info, he told me that Mike was burned by a girl like me in the past, and Mike was just looking out for him. Apparently, that's the same reason why Mike doesn't do relationships. As for Jack, he's harmless and was just agreeing with Mike for the sake of avoiding an argument. That's just his nature, my boyfriend says. I suggested hanging out with them to get them to change their opinion of me, but he immediately shot that idea down. The way he saw it, Jack will probably become accepting of me, but Mike abhors and detests girls like me. 

My boyfriend admitted to talking shit about his other buddy's girlfriend (now ex) in the past as well. He called her a bitch, but at the same time, he tells me that she never made an effort to meet them, even though the relationship was over 2 years. His friend was practically MIA during those 2 years. Furthermore, the breakup was rather messy, so it just proved my boyfriend and his friends were right about her. Maybe that's why they're suspicious of their friend's girlfriends?

Is the fact that my boyfriend wasn't bothered a red flag? Or is it normal simply because he knows them way better than I do? Also, should I be concerned about him hanging out with his buddies, especially Mike? For all I know, Mike could be poisoning the well, which would then lead to my boyfriend becoming distant and wary. Not that I'm saying he's easily swayed, but it could happen. In the end, he reassured me that he trusts me and won't let Mike's stupid tirades convince him.

Condense the text into a few key points
<bot>: Told my boyfriend about his friends talking about me behind my back. He wasn't bothered, should I be concerned?