'legit' is a colloquial usage of the term 'legitimate'.
The third definition of 'legitimate' in mainstream dictionaries is:
Valid or justifiable.
What is valid or justifiable is subjective and thus anyone can say anything is legitimate, without needing some kind of bizarro external authority to pat them on the head.
You have justified that anything you believe must be true because of how you feel about it, regardless if whether it is true or not.
"truthseekers" - finding the truth in how they feel about things.
Spoiler: don't let facts get in the way, everything is legitimate.
Great work there mate.
No, I haven't. I didn't even mention feelings, you are just using this tired trope as a lazy get out clause to avoid the depth involved.