Don't worry, I'm not feeling left out. Actually I like hanging out with "the girls" sometimes more than with guys--I'm not into sports on TV enough, I guess!

How would you validate him saying it's her fault? Just out of curiosity, not very good at the validating! Thanks!
Well, you don't have to agree that it is all your fault, and that's good since you probably don't BTW, a lot of it is non-verbal. You sure can't be actually rolling your eyes!
Instead you validate that you understand them. In this case, they are probably blaming you because they are upset about something else. So validate that they feel angry or hurt about something. "I see that you are upset at having to pay for insurance." or "I see that you feel trapped by these financial obligations."
I consider myself so-so at validation (and I don't always remember to do it at the right time!). This workshop on it has great examples:
Communication using validation. What it is; how to do it4now, can you describe an example where you wished had validated well instead of what you did say? You can get a lot out of posting a difficult situation, your best try, and seeing what others here who are much better at validation than I am will say.
Are there any books or resources on this site that you guy have found especially insightful? Especially in regards to communication techniques?
I've read the High Conflict Couple, and it does a great job of addressing how to stop invalidating and start validating. You can work on it alone, or with your partner.
If you are still doing things which are invalidating, it will undo all the hard work of validating. So make sure you get this part figured out FIRST.
TOOLS: Stop Invalidating Your Partner