This was the same logic that allowed talented men to turn their workplaces into a very unwelcoming place for women by allowing them to make sexual jokes, proposition their coworkers, and have business meetings in strip clubs. If you are going with the “take your whole self to work” spiel you can argue that sexuality is a bigger part of most people’s lives than politics. So if we can ask for co-workers to not discuss their latest bedroom exploits, surely we can ask for people to not talk about politics at work.