"mental health conditions" is rather broad along with the intersection between insomnia and depression. you probably just suggested that nobody should take melatonin because you had anxiety.
Sure, this is definitely a strawman you could make.
Here in reality I suggested that those struggling with MH conditions shouldn't self medicate.
Melatonin should never be taken... is different from recommending not to self medicate.
The previous comment can also be read as "disregard medical advice if tells you to take melatonin"
But yes, I definitely recommend people not to take hormones unless they know exactly what they are doing. Just because something is for sale over the counter, doesn't mean it's safe or good for you.