In the video above — which has been shared on Facebook approaching 2,000 times at the time of writing — Sean explains his condition, how it's affected him and how he thinks people without autism can help those who do have it.
"Stuff like loud noises and loud music just really get to me," explains Sean. "Stuff like personal space... it makes me a bit uncomfortable when people are too close to me.
"One of the most important things is be understanding," he said. "Try to let them in to your activities. Always use literal language; never be sarcastic."