Killjoy Guide To Ice Box

I hear people often say this about maps and I genuinely don’t know what makes a map that way? I know what the terms mean, but not the criteria per say. someone explain??

The key is positivity. Bring people up, not down. If someone is toxic to you, don't spread it. Either ignore, or be even more positive. Try to regularly compliment teammates (and even enemies) after winning rounds or nice shots. Don't troll...