While Dora may be disregarding Tai's feelings - and I agree that it's fair to say that she is - Tai is doing the same thing to her, only with better intentions. Dora's current approach to dealing with these issues isn't healthy, but she's also not in a place where she's ready to discuss them at length, or change her stance. If nothing else, maybe she doesn't feel like talking about right now, at this very moment with Tai. Perhaps she just wants to unwind after a day at work, and not think about all that right now.
Tai isn't completely out of line for pushing the issue, and it's fair that she wants that connection with Dora. At the same time, her approach was lacking in tact. Furthermore, if Dora does just want to unwind after a long day at work, and not get into some heavy issues in her life right now, is that something Tai really understands? After all, her approach to work is far more relaxed, and without the same burdens and stress that Dora is under. Her "Would it kill you to open up a little?" could also be read as a bit whiny, as much as it may be good advice. What's more important: that Tai feel validated, or Dora be given some space and allowed to deal with a tough issue in her own time?
It's been brought up already, but I also think it's important to keep the extent of Dora's pushing people away in perspective. We're talking about two people, not a whole lot (to use the word Tai did) or a constant stream of people. Just two. The first is someone who is a family member, yes, but also someone that she does have a strained relationship with. The trigger event was iffy and somewhat of an overreaction, but it's a little more understandable in the grand scheme of things, when their whole history is taken into account. The second person is someone who made a huge mistake and forced her to make a tough but reasonable decision as an employer, which unfortunately had additional ramifications due to them also being friends. Giving Faye her space is not a bad idea, given the circumstances.
As far as the future of Dora and Tai's relationship, perhaps this will be a good thing. Perhaps it will encourage Dora to open up a little. Perhaps they can grow as a couple, because the argument will allow Tai to get over her infatuation - and she's been infatuated for a LONG time - and they can settle into a stable, post-honeymoon period relationship.
I really don't think any of the cast members are in a position to scold Dora, either...least of all Marten. I mean, if he's going to criticise anyone for being passive or passive-aggressive, they've got so much ammunition against him that he'll be apologising for weeks.
Besides, that's the wrong tact. Dora needs to be offered a calm and logical perspective, or asked a question that is firm but non-confrontational; something that will prompt her to evaluate the situation and help her move forward in dealing with it. Confrontation and lectures are not going to be effective, they're only going to trigger defenses and cause insult.
Come to think of it, Dora and Faye are basically opposites in how they should be helped by the rest of the gang. With Faye's abrasiveness and preference for intimidation, it takes a stern remark (such as the one Hanners delivered last week) or blunt question/statement (see some of her early interactions with Raven) to cut through her defenses and get a message through. With Dora's temper and insecurities, letting her calm down and appealing to her common sense and rationale seems a more effective approach.