Only feminized cultures insult each others mothers, as this insult implies an attack against the son himself, as the mother was and is the primary link to the world and source of confidence.The mother in its dissonant role as the childs primary overlord, but also as the husband subserviant, leads to the childs sympathy in its own subserviance to the absent, abusive father. This oversocialized identification makes an attack against the mother an attack against the self, which leads to absurd situations like "patriarchic" societies, for example R*ssia or I*lam, fighting over womens honor and rights, as if foids have either of these things.
If you insult mothers you are a brainwashed cuck.
If you get insulted by this you are also a brainwashed cuck.