I think people are sleeping on Atletico Madrid this season, they have a solid squad and a great coach, they could make a deep run in the UCL, especially if they can get their defense clicking properly.
It's not that many people don't pay attention, but most people still think that a team like Atletico Madrid is still mentally inferior when competing in the Champions League because there are many teams that have the mentality to win the Champions League. In addition, Atletico Madrid will also face Real Madrid, who are generally still strong in the Champions League every season, so this will still be a serious obstacle for Atletico Madrid this season.
It makes sense and indeed when talking about them there is certainly more talk about Barcelona and Real Madrid who come from the same league. It doesn't mean they are bad, but in terms of name they are still inferior and the 2 clubs I mentioned still have more appeal.
Maybe it would be different if the situation was that they were the only club representing La Liga. And actually if you compare, then the other clubs are the same. There are clubs that get less attention because more people are more interested in other teams that are considered more interesting to talk about.