They like the version of the '60s civil rights movement they constructed in their head. Their conception of old X-Men can fit into that.
Notice that conservatives complaining about “wokeness” always point to superficial attributes. A woman protagonist in a superhero movie, a half second lesbian kiss, or a black actor for a traditionally white character. They don’t point to media that has even slightly deeper ties to leftist thought, such as Andor or The Expanse. If they do at all, it’ll be for only those superficial attributes. They don’t even recognize it for what it is.