aleagueist

it's like "Atheist" but just that "Aleagueist" means someone who does not support any soccer leagues
"Aleagueist" is similar to "Atheist". "A" in greek means 'no' "ist" refers to the people who practise it so "Aleagueist" directly translated means "people who practise having no leagues" but if properly translated it would be "people who do not support any soccer leagues"

I am a boring person! I am an Aleagueist!