That was the case when I was younger. I followed only PSG, and defended them even when they were wrong. But it changed when I grew up (not saying anything bad about people who stay the same, just that for me, that's how it went, that's all. No ill meaning behind my words).
Nowadays it's easier to follow different clubs. You can watch games easily. More coverages, more TV/Internet offers. You can watch replays. And, you can read message boards.
You could try it one day. It isn't that bad to follow other teams, especially if you have a reason. Mine was that Pogba was there. Started to really follow Juve since then, doesn't regret it. Serie A is a great overall even if some complain that Juve leaves no place for others.
Also, let's be real. The French League is bad compared to Spain, England, Italy, or Germany. easier for french to follow foreign clubs. You will find many people like me in France. Yeah there are PSG, and Monaco, but 90% of the games are the same with 9/10 teams building a bus, and that's all. It's awful (even if Monaco did marvelous this season).