Since this is the spoiler thread, would you mind elaborating?
Okay elaboration time
The reason why Martin can be charged with racism to some degree is his description and treatment of Slavers Bay and the Slavers. Not only are they Slavers but they consider puppies to be a delicacy, they dip slave children in honey, blood and wine and make them fight a bear. They literally have old people go at each other with cleavers and poles. Every single inhuman behavior can be found. Let me quote Wiki
Wiki on Slavers Bay wrote:
South of the Dothraki Sea is Slaver's Bay, which holds three port city-states called Yunkai, Meereen, and Astapor. The cities were built from the rubble of Old Ghis, an ancient rival of Valyria that was crushed by that nation thousands of years before the events of A Song of Ice and Fire. Present inhabitants of the bay are a mongrel race that speak a bastardized version of the old Ghiscari tongue. The economies of the cities are largely based on slave labor and the slave trade. Treatment of slaves is often harsh, while citizens live in relative luxury. Professional soldiers of all three cities wear outlandish costumes and hairstyles that limit their usefulness in battle. The cities' militaries are highly dependent on additional slave and mercenary armies for the actual fighting. Astapor trains and sells elite eunuch spearmen called Unsullied that are renowned for their discipline and effectiveness. Those Unsullied that have not yet been sold are used to defend the city when the need arises.
The wealthiest of the cities, Astapor is the only place in the world where the Unsullied can be purchased. These slave soldiers command a huge investment and earn the most profitable of returns for the Good Masters of Astapor. The city itself is ancient and dilapidated, with massive, crumbling red-brick walls that the Astapori no longer man. The city is dominated by massive brick pyramids that line the waterfront of the bay, and the Plaza of Pride, which serves as an open air slave market, a marshalling area for the Unsullied, and a community gathering place. Even though the city has long passed its glory days, it is still a wealthy and powerful trade hub, with countless slaves, massive fighting pits, and training areas for gladiator and Unsullied slaves.
The smallest of the three cities, Yunkai, like Meereen, does not trade in Unsullied but is known for its fighting pits and its pleasure houses, both of which turn out slaves at a brisk pace. The city is similar to Astapor in architecture except for its smaller size and its use of yellow brick in its buildings instead of red. The slavers of Yunkai are known as the Wise Masters. Because of the city's lack of Unsullied, it relies on a mixed professional and slave army of approximately 4,000 with at least 1,000 mercenaries. Typical for Ghiscari, Yunkai soldiers wear impractical armor and oiled hair teased into enormous shapes, limiting their effectiveness.
The largest of the three slaver cities, Meereen has a population equaling that of Astapor and Yunkai combined. The city is constructed with similar architecture to its neighbors, but built in bricks of many colors. Its landscape is dominated by a massive pyramid, named The Great Pyramid, and the Temple of Graces, which is capped by a golden dome. Meereen is unique among the Ghiscari cities in that it is filled with many temples and pyramids. The slavers of Meereen are known as the Great Masters. They field a force of lancers equipped in traditionally extravagant Ghiscari fashion with scales of copper and lances as long as fourteen feet. Its is built on the banks of the river Skahadzhan.
The point is that for a serious made up of believable characters and all sorts of interesting people we get this literal stereotypes, Sauron wish he had people this evil to rule over. This is where the racism charges best bear fruit because of how extremely unlikely such a people are to survive for long as their entire culture depends on the slave trade, the slaves out-number the citizens ten to one and they are casually murdered on a daily basis yet have almost no military of their own. Only Astapor has any kind of significant military force. Someone should have sacked and burned these cities centuries ago if not the population had no died in a mass slave uprising.