On a community level, the most dangerous mentality to internalize is one that wholeheartedly vilifies “gatekeeping.”
Social and political movements eventually reach a point where they cease being about helping people and shift focus toward perpetuating the movement itself. In addition to making them more extreme, this causes them to be more insular and less accepting of people who don’t fit the mold of the ideal member of the movement.
People wrap their social acceptance (or lack thereof) up with various forms of identity, and hobbies are no exception.
This is a result of a faulty premise.
Are you truly showing appreciation for the things you like if you're still paying attention to the things you hate all the time?
Counter to stereotypes and conventional wisdom, the otaku lifestyle is meant to be a long-term, sustainable endeavour. Therefore, it must be principled.
It’s the story of every anime fan’s introduction to anime: