Your post doesn't make much sense lol nothing in his presented him as immature. He was legitimately confused on his popularity and expressing his opinion. Granted he probably didn't have to say broman fans are immature but hey it's his opinion and you sorta reinforced his belief.
I'd say the only immature portion was you replying to a persons opinion combatively and questioning is maturity.
You clearly like broman and aren't mature enough to handle the criticism of him or the things you like. If you were mature you A.) wouldn't care what an anonymous poster on the internet said and B.) wouldn't need to try and declare how mature you are lol
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Ok if that's really how you feel then I guess.