
To me nothing can make it okay except if they could go back in time and say “were not going to exclude someone we like just because you hate them” but I’m not sure if that’s the BPD talking (they made a mistake and thus they cannot be my friend anymore)
I think you’re right that this should have been the response and your friends should have stood up for you.
But it also doesn’t sound to me like they were deliberately excluding you. Especially coupled with the “just pretend the other person isn’t there” it sounds like they’re mostly just too scared of conflict and were hoping the issue will go away by itself. Which is still poor behaviour but also not necessarily a sign of them not wanting you in the group. So my personal take is that you’re right to demand that your friends stand up for you more. But if they can do that and do stand up for you, I think it would also be fair to give them a second chance. Everybody makes mistakes at some point, it’s how people respond to those mistakes that really defines them imo.
You say you possibly were insensitive but that is not a reason to hate someone/not want to be around someone.
So how is that so different from your friends, who generally seem to appreciate your company, not realizing in the moment that their behaviour made you feel excluded. Just like you maybe didn’t realize your behaviour made the other guy feel excluded/looked down upon?