In modern fandom, there is a common problem with older fans taking offense to new entries in a franchise directly appealing to viewers younger than them. Blue Beetle is one of those movies that seems to care most about attracting kids or new fans. This stands in contrast to recent DC cinematic fare, like The Flash, which is more directly aimed at adult audiences. So, even though the joke in the Blue Beetle trailer about Batman being a fascist has roots in comics history, some fans are annoyed at the "disrespect."
Source：https://www.cbr.com/blue-beetle-batman-joke-roots-comics-history/
