and it's important to note that Ari is sharing her experience as a CHILD watching Martin.
she's not saying "oooh chile ..... i went back and replayed some seasons and FOUND some problematic mess to talk about!" (which still wouldn't be wrong)
so people aren't just dismissing her recollections as an adult Ari, but they are dismissing that little girl who was watching Martin and probably HEARD a lot of those same jokes Martin was using against Pam ...used against her in settings like school and even amongst family.
i 100% believe her when she says she felt discomfort with some of the jokes as a young girl watching the show
the woman who looked the most like her on the show was constantly called an animal and nappy head.