A pride flag serves two purposes: to provide a symbol for community, like a national flag; and to serve as a shibboleth to indicate inclusion in that community in a way that is obvious to other members of the group, but passes by others unknown, like a handkerchief in the back pocket. The heterosexual pride flag is, of the two, the least disagreeable. While it is true that straight people need not announce their identity to have it affirmed and that straight people have no issue finding others to associate with, there are a few limited times where the straight pride flag does become such. At a pride parade, for example, straight people are generally a minority there and the flag does signal inclusion in a particular group that would be non-obvious. However, at a Nazi parade, the black-and-white bars are not a symbol of community, but a symbol of hate. The subtext of flying that flag at that place (usually next to a swastika) is not one of "I exist", but one of "If you can demonstrate and show solidarity with your brethren, then I can with mine"—- ignoring the fact that Nazism is not a sexuality.
A super-straight flag more firmly falls in the camp of the latter parade.
While the heterosexual flag has limited but useful applications, the
super-straight flag has no useful application. The
super-straight flag appeared on TikTok in 2021[2]. The
creator claimed that Women that are born women so you can't say I'm
transphobic now because that's just my sexuality you know.
With its hateful origin and its hateful perpetuation, the promulgation of
the super-straight flag does not appear to be intended to represent the
sexuality of the wearer in a useful manner or invite community, but instead
as a shibboleth of hate — but a swastika does that just as well.
[1]: Snopes. "Did the 'Super Straight' Trend Originate With Nazis on 4chan?". 2021. https://www.snopes.com/fact-check/super-straight-nazis-4chan/