Season two of Infinity Train saw Jesse meet all sorts of bad people. The Apex, however, take the cake as the worst. Their casual cruelty towards the denizens of the Infinity Train, who they dehumanize by calling “nulls”, is far worse than the neediness of Marcel or the parasitism of Perry.
If you take only one lesson from The Mall Car, let it be this: be careful who you hang out with. You’ll turn into them over time, and while Jesse saw what the Apex were like before it was too late, real life doesn’t always turn out as well as it did on Infinity Train.