Ted, the Deaf man signing in the video, made an assumption that the beggar could not possibly be deaf but hearing simply because the beggar did not know sign language.
Now, there are two possibilities.
1) The beggar could be deaf or hard of hearing and does not know sign language.
2) Or the beggar is hearing and does not know sign language.
Ted assumed the beggar is hearing on the basis he did not respond to Ted's signing to him. And thereby concluded the beggar is lying about his medical condition and not deaf at all. But the beggar could have been born with a hearing loss or is a late deafened person who is homeless.
There are many deaf people in the United States who do not know sign language.
The majority of people who are deaf and hard of hearing do not know sign language. According to a Johns Hopkins study, more than 48 million people in the United States are deaf or hard of hearing, or a fifth of all Americans. Of these, almost 99 percent lost their hearing or were raised orally–not using sign language–and rely on their residual hearing (aided by hearing aids or cochlear implants), speech reading, and the printed word for communication access. This group of people are greatly aided by text forms of access.Just because you see a deaf person does not mean the person knows sign language. Bad assumption. Best way is to get the facts first. If indeed the beggar is hearing, then shame on him. If indeed the beggar is deaf/hh, then double shame on Ted. Either way, it's a bit disgusting to watch.