It's obviously possible. Personally I could never be with someone who has the "exact opposite political views", what's the overlap then? That would be far too shallow a relationship for me, but more power to them if it works for them, I suppose. Political views aren't just opinions, they are a representation of how one views the world. To completely ignore them and never talk about them means ignoring a huge chunk of your partner's character, their views, their opinions, their values, and their beliefs.
Also, another reason why "everything is so serious these days" is the global rise of fascism we are experiencing right now. There's a massive difference between "we should or shouldn't use tax money to improve roads and pay for school lunches" and "deny people life-saving healthcare, deny crises like climate change or pandemics, blaming things on Jewish space lasers" and so on. The former isn't seen as much anymore nowadays, it's mostly the latter. And that directly impacts the lives of millions of people. It's easier to ignore politics when you aren't affected by the direct actions of your fellow men.
