Might be a small point, but people marry those who they like. If you change into someone with no filter, then yeah you'll get that divorce. If you've always been that person with no filter, then your marriage is safe considering that's the man your wife/woman your husband married. If expectations get set at a certain place and then suddenly change, friction will happen, regardless. Even if it's going from "no filter" to "tactful response", that's going to cause interpersonal friction as well.
PG seems to have cultivated a perception of "no filter", and so when a person hears, "Let me get Paul", you generally know what's coming. You don't join YC to get patted on the head.