I did not have this happen here on TB, but I did have something similar happen on another board. I once posted on a BIRTH MONTH BOARD (not even an IF board) about how to announce my pregnancy to a friend who had the same diagnosis as I did (DOR) and who we had sort of been going through the journey together. I was only about 8 weeks pregnant at the time.
I then got the most horrible private message from this lady telling me that I had no idea what my friend was going through, that I wasn't really "infertile" because I had gotten pregnant through only Clomid/IUI, that I had no idea what infertility was like and basically I was a horrible person. Not only did this woman already have a child, but this lady also had a DOR diagnosis like myself and my "numbers" (AMH/FSH) were worse than hers. Plus, on top of that, I am a Fragile X premutation carrier (which is what cause my DOR) so I not only had the IF issue, but I then had to worry about whether my child was going to be normal/healthy since there was a chance my unborn child could have had Fragile X--which causes mental retardation and autism. Yet, she was telling me I wasn't really "IF" because I had gotten pg through just Clomid/IUI. Ironically, she ended up being due about a month after me so she was probably pregnant when she was writing me and just didn't know it yet.
Everyday I feel like the fact that my son is healthy and normal (and the fact he was conceived without more serious intervention) is nothing short of a miracle. However, I really hate it when people make "IF" a competition. I think you just have to remember that most people can't see past their own pain. It doesn't necessarily make them bad people...I think it is just human nature. I just always try to remember that everyone has their own struggle/journey. Maybe someone doesn't have trouble TTC or IF, but they may end up with a child with a disability and that is entirely different struggle. Or they may end up having to battle Cancer...or who knows what else. EVERYONE has some struggle at some point in their life. Hugs to you and congrats on your babies!!!