>>32102191social constraints.
adults back in the day didn't take pokemon seriously, and kids wanting to be aduts started imitating them.
its the same reason why people starts drinking coffee even when they don't like the taste. the unfficial psychological term for this phenomonom is 'chu2'. but since this chu2 seems like 'normal' it stuck.
people deny their own fun, and there is nothing you can do about it. just, don't let it get to you.
(you aren't one of those retards that think cartoons and anime is for kids right?)