I once had a buddy who got stiffed a hundred bucks on a freelance gig for a guy who was starting up his own firm. Not a huge deal, my buddy grumbled about it, and kept on scrapping his way through the recession. A decade later, I just found out the dude who stiffed my friend is now in a lawsuit with some former partners at that firm he founded.
It can feel quite unfair to hold someone against their worst moments, especially if its over small things, but it may be prudent to stay wary.