Why do late 90s babies get some much hate & Gatekeep so much from early & mid 90s babies???

Y’all love to gatekeep the late 90s babies (1997 1998 1999) just because they were born at the end of the 90s decade when in reality they’re reaching near their 30s only in a few more years the shit gets lame & played out before you know it all 90s babies gonna be in their 30s at the same time when 2029 gets here but 1999 babies get hated the most for no specific reason at all even when they’re not saying nothing yall quick to exclude them from the 90s like Wtf is up with that it’s weird like I don’t get it cause last time I checked 1990-1999 is the 90s yea I understand y’all all didn’t grow up the same but still y’all don’t have to keep gatekeeping the late 90s babies from every damn thing they still had some things in their childhood that was still millennial traits