@Tamahime It's a joke how people (usually men) with height that starts with 5' are consider "short" (even if it's 5'11") and if you height starts with 6' you are considered "high". It's non-imperial it's usually 179cm or shorter and 180cm and above.
Some people are really shitty about someone being short, but this time it's clearly a joke.
It's actually how people perceive numbers. It's like something cost 5.99 is 5 in our brains, but 6 is "more expensive" even if it's only 0.01. That's why prices in shops are usually .99, .95 or anything like 99/999/9999 etc. If something is 1000 it's "expensive", but for 999 it may shows as "reasonable".