This person did an insanely high dosage of DMT. Most people can hit "breakthrough" levels at 20-30mg, and I rarely hear of even experienced DMT users taking more than 50mg. 100mg for someone on their first real trip isn't something anyone should do - and from their general attitude towards tripping solo when knowing they aren't in a great mental place, it doesn't seem like they're particularly experienced with shrooms or lsd, either.

I wouldn't cautious people against social drinking to the point of getting a buzz just because getting blackout drunk is often an unpleasant experience.