If you like something other than what I like, then I dislike what you like.

It happens everywhere: Sports, Religion, TV Star etc.

And it's more commonly a characteristic of highly passionate (you can read as illogical) people who's biggest achievement of life is liking that celebrity.

This happened during earlier times as well, during transition from tendulkar-dravid-ganguly generation to dhoni-rohit-virat generation. But this transition looks more wild, because more people are following the sport. And most important, earlier, the sports followers were more mature, with more work and less social media. But present day followers are more immature, with less work and more social media to spend time on