I experienced mild brain freeze as a child but it went away in adolescence. It doesn't seem pleasant so I don't envy those of you who get intense versions of it.

So it seems, it just happens to include everyone I've ever talked to about it

I'm surprised it's so few! I'm in the 60-70% here -- I've never gotten it (despite many deliberate efforts), but I've never known anyone else who seems to be immune.

I have to be so careful eating cold things, it's like freeze++, brain glaciation.