Why are people on Minecraft Forums website Mean?

its like, no matter who ya friend on there, they act all nice to ya one minute and then turn mean the next. For example, they'll be friends with you for 2-3 days then unfriend you and then when one ask why they say mean things about that person thats not true. Its like they're looking for reasons to unfriend. Or looking for an excuse to not be friends with that one person. Anyway, anyone know why this is?

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