You're correct in that the simplified version just leads people to come to wrong conclusions and shouldn't be taught. Prime numbers aren't really important to the math being taught at grade school level and can probably be a subject held off until middle or high school level math when the students can better grasp the concept of what they are, why they're important, and what constitutes a prime. But the problem here was that the OP, after people tried to educate on the misunderstanding was still arguing that their wrong opinions why 1 should be considered prime were just as valid as the facts proving that it is not.
Yeah, I've already reached the conclusion that the OP is either a troll or deliberately obtuse a while ago.

At this point I'm just participating in the general discourse and referring back to my own experiences about what I was taught about prime numbers (and how I think it could be the reason why some people might legitimately think 1 is a prime until told otherwise)

Because this is the same person who started a thread complaining that "November isn't fall!" Which sparked the comparison of "1 is a prime number!" and failure to accept they're wrong when faced with facts and move on.
Oh damn, it was the same person? I didn't even realize that.

I only used that as an example because I remember seeing it here recently and it built up a rather infamous reputation. But now the reason why that topic continued to be discussed here is clearer...