Tinder chick meets me at bar with roomate

Hey fellas, back from hiatus.  Good to see ya all.

So this chick from thinder asks me to meet her near he place in park slope brooklyn.  Its far from where I live. like 40 mins or so.  She tells me later her roomate was going to be there.  Well I said what the hell see where this leads.  I get there we start chatting.  I talk to them as well as others at the bar.  Everything goes great. 

We start talking about Sean Penn and I made a comment about I don't understand how people get offended about him joking with his friend at the oscars(look it up if you dont know what I mean but its not important).  The roomate gets offended.  She is African-american.  She says that that is a racist comment.  We get into a whole argument about it.  Finally my chick says OKOKOK everyone quiet down. Both sides are right and blablabla....well it goes awkward from there, you can kinda cut the air with a knife.

Roommate goes to BR and we start talking shes genuenly interested in me, what I do etc.  Roomie comes back, and its all weird air again.  So bar closes, I ask if they want to go somewhere they say we have to pee.  They go to BR to pee, prolly to talk it over.  They come out, I"m chatting with another chick outside.  They say they are going home.  I say cool, bye.  My girl asks if I have a car and can give em a lift.  Sure.  She yells the roomie back we start walking to the car.  The roomie changes her mind and does not want to go. they flag a taxi.  my chick says lets be in touch.

She was totally interested and down, but roomie had weird vibe from the start actually now that I think of it.  They apparantely met anothe dude the night before off tinder.  I say you guys always double team tinde?  My chick says its dangerous etc.  Anyhow she was totally down.  I think I was too passive, not lead the convo enough allowed them to talk about nothing, and nonsense.

What could have I done differently?  As I was arguing with the roomie I was thinking I dont give a shit if I dont get laid, I'm not going to not say what I feel.  (My whole day was like that, I think I woke up with aggrevation for no reason.  Whatever.) I'm ok with the result, but what can I learn or take a way from the experience.  Also should I hit hir up again?

peace