TL;DR not only it is not ridiculous but if you do see this as a battle fought on behalf of patriarchy you are missing the point. [/spoiler]
You think the Romans did it because of patriarchy? are you insane? Romans took over plenty of male ran tribes once their rulers had died, either be forcing the current heir to leave their kingdom/land to rome when they died. or by provoking said tribe by injustices to make them look like the aggressor to justify a military takeover such as what they did to the iceni. It literally had nothing to do with "patriarchy'.
