No one can be mature all the time. For every situation, there is a mature & immature response.
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*Keeps emotions in check. (Failure = Guys who get into public fights of any kind, grown women who cry for any reason other than trauma or major loss).
*Does not use tantrums to try to sway opinions, does not try to destroy something many people love because they personally dislike it, avoids scapegoating or hating on things because it's trendy. (Failure = Strict parents, politicians).
*Puts health before pleasure or reputation. (I love CultMoo & they seem like nice guys, but they're both going to die of liver failure at an early age between the beer & hot peppers).
*No longer remembers what it was like to be young & is therefor unable to sympathize, empathize, or compromise with their children. (Strict parents have basically reverted back to the little sociopaths they were as babies).
*Has a job, hates it, but continues to work there instead of finding something fresh the minute tedium kicks in. (Failure = Me).
*Is in financial debt & knows the value of a dollar. (Failure = Shopaholics who have tons of credit cards).
*Has given up on things like spite & vengeance. (Unless it's being dished out legally in court).
*Capability of being completely responsible longterm for another life. (Parents, pet owners, caretakers).
*Doesn't write or draw copyright infringing fanfiction or fanart porn & post it on the net for all to see & never be able to unsee, especially if it promotes taboo subjects like bestiality & paedophilia. (Failure = Half of Deviantart users, mangakas, hentai game developers, Furries).
*Doesn't troll forums or chats. (Games should honestly just disable chat for anyone under 18).
*In reviews, leaves constructive criticism with proper spelling & grammar instead of "this sucks." (Failure = 90% of Blackberry Playbook app users, Youtube & Cracked commenters).
*Has realistic expectations about things. (Failure = People who leave negative reviews on freeware apps, couples with low budgets who expect realtors to find fully furnished homes with all their must-haves & no renovations).
*Swears naturally, but doesn't go out of the way to abuse swearing like it's going out of style.
*Puts needs over wants. (Failure = Hoarders).
*Doesn't have a maxed out character who hangs around low level areas to kill noobs & alts, doesn't stubbornly cling to a game & declare any remotely similar game as inferior, can handle criticism of favorite games without flying off the handle & going into an endless debate.
*Posts comments that are on-topic, does not go out of way to incite arguments. (Failure = Youtube commenters).
*Knows that you catch more flies with honey than vinegar. (Failure = People who contact support/customer service barking demands instead of making polite suggestions).
*Does fact-checking instead of immediately believing something they read or heard & spreading it.