Having a favorite competitor in an industry is not that same thing as being a big fan of monopolies. That doesn't make sense. Having a healthy competitive industry does not mean that every person uses products from multiple competitors.
Having a favorite competitor is fine. Having so much loyalty to that competitor, however, is cultish. What happens when you get tired of that competitor, and some other competitor is offering something better? Or your favorite becomes abusive and you want to move? By supporting that competitor so strongly, you've encouraged monopolistic behavior, and now you're going to suffer for it, because there won't be good competitors any more, or you'll have a very hard time freeing yourself and migrating to the competition.
