I don't see Mr. Bennet as an INTJ. He mostly keeps to his library, reading and appreciating his two older daughters. He's not openly critical of people, even Darcy, though he makes fun of them. He's a very Rational man; INTJs seem more emotional to me than that.
I see him as more of a P than a J. Eg, he avoids taking a stand with Lydia; rather than forbidding her to go to Brighton, he avoids a confrontation and hopes for the best. If we assume he's INTP, his wife would be his opposite, as she certainly seems to be - social, opinionated, engineering meetings between her daughters and eligible men, "a woman with a mission." Her husband is much more likely to let things develop and only deal with them when absolutely necessary.
When proved wrong, he swings all the way over to the other side - "no officers will be ever be allowed in town." That feels like a very familiar INTP pattern to me. And an INTJ who said he wasn't allowing Lydia and Wickham into his home after their cobbled-together marriage would really mean it.