Parenthesis serves the purpose of homoiconicity and it looks like Clojure is homoiconic... sexp / lambda expressions / HoF / macros / etc.
You know: "If it looks like a duck, swims like a duck, and quacks like a duck, then it probably is a duck."
Regarding people like you, the "haters gonna hate" type of people, here's what Rich Hickey has to say:
"Life is too short to spend time on such people. Plenty of Lisp experts have recognized Clojure as a Lisp. I don’t expect everyone to prefer Clojure over their favorite Lisp. If it wasn’t different in some ways, there’d be little reason for it to exist."
I'd add that you're commenting on a board created by a real Lisp hacker who created its own Lisp and, if I'm not mistaken, who's now recommending Clojure has the Lisp dialect to learn for Lisp newcomers.