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via Left Coast Right Watch
As time went on, several within the Charlie Kirk vigil began to falsely accuse Sanchez’ group of being “Antifa.” Pointing to their masks, several began shouting at masked members of Patriot Front and Active Clubs to “show their face.” Several times, as the rhetoric from the white nationalist groups became even more explicit than usual, vigilgoers attempted to pray loudly and unsuccessfully to drown them out.
One man, carrying an American flag, taunted the group with several others. Calling them “un-American,” and “traitors,” he followed them to a parking garage several blocks away where the group was walking through. Suddenly, about a dozen began kicking and hitting him. The group then fled into the parking garage.
Allow me to diagram that sentence's syntax:
[My profile] is rather a {eclectic mixture of things} that isn't for the faint of heart
"is" modifies the text in brackets.
"isn't[sic]" modifies the text in curly braces, not the brackets.
ie. You seem to believe that you typed: "My profile, a rather eclectic mixture of things, isn't for the faint of heart", when that is not the case.
Regardless, you're arguing in confident ignorance of the fact you've used "a" instead of "an", as well.