Just because the series got changed after you started liking it, doesn’t invalidate your ability to like what you liked before.
Which would then lead one to be more specific.
“I’m a fan of TOS”; or “I’m a fan of the even-numbered Prime Kirk movies”; or “I’m a fan of the movie reboot”.
“I’m a fan of the Star Trek franchise, but only 55 episodes (of 729 available), and let me bitch and whine about why the rest completely suck” does not type, in my opinion.