Everyone has an uncle, brother, mother, friend whose a doctor/scientist/authority of some variety. They usually are as ill informed and wrong as the general populace but use their mother/brother/friend/second cousin for imagined and unwarranted borrowed authority.
Borrowed authority is actually such a fantastic sign of bad information that if someone said my brother the professor of mathmatics says 2+2 is 4 I would pull out my calculator to check if this was so.
Its also a logical fallacy to suppose that because I don't support your contribution to the discussion that I support the position that people should eat their kids meds. Someone can disagree with you or some detail of your discussion without acquiring the beliefs of whomever you are arguing against or imagine you are arguing against. Try to stick with what people actually say and argue that.
Lastly the idea that there is no middle ground between being educated enough on a matter to discuss it and consulting said professional before posting is disingenuous. You needn't be a doctor to discuss medicine on the internet just educate yourself on the matter rather than passing on slightly wrong anecdotes from prior conversations.
Here’s a simple one... why do some children react to Benadryl by getting a lot of energy? The rest of us get drowsy. Some children even get drowsy. Should we ask a pediatrician before commenting? At least that’s the warning my pediatrician told me, but apparently that’s second hand so it shouldn’t be mentioned by anyone but a licensed authority.