I know this is just a joke but I pray that y'all can learn to respect people's boundaries and understand people have things they prefer and it doesn't make them a coward for establishing these boundaries, even with fictional characters

"all characters are 18+" individuals most likely state such because it's what they're drawing and don't want the attention of people who automatically assume every character is 10 and deserves rights.

People are allowed to have squicks, even as a pro-fiction individual. Not everything will cater to you and how you view these fictional characters. Do not start mocking people over this type of stuff, man.