I suppose the problem is, do we need to vet everyone for sharing the same humour and standards of acceptability as us? If we're joining the same football team or going to a comedy club and some beers, I wouldn't particularly enjoy hanging out with someone as dull/safe as I am at work. But is it ok to say to a woman, "We'd love to welcome you onboard so long as you don't mind the dick jokes constantly flying around the office."? (Whether explicitly or implicitly, I don't think it is ok).
If we really want to solve the clique-problem in tech, we need to either change the boundaries of acceptable humour and behaviour. No-one wants to spend 8 hours a day in a "sterile humorless environment". I know I had the most fun coding in my early 20s in an office where 90% of us were just out of university and male.
There are going to be more tradeoffs towards inclusiveness as we go forward. Even it reduces the fun sometimes, I think it's the right thing to do.