Back in the time of Jesus, "Samaritan" did not mean "one who does good deeds." Samaritans were a ethnoreligious group. Still are an ethnoreligious group, actually, which is why it's kinda weird that we use the word to refer to anything other than the real people today. In a Biblical context, Samaritans were mainly relevant for being an ethnic group Jews didn't much like. At one point in the Bible, someone even calls Jesus a Samaritan as an insult, right along with the insult "demon-possessed."
The reasons for this prejudice were long and complicated, so all you need to know is that, as with every interethnic political feud, there was never any good reason to hate individual members of the maligned group. And that was why Jesus told a story about a Samaritan. In the story, two Jews pass by the battered guy without helping, and then the Samaritan is the one to help, to the listeners' surprise.
Balthasar van Cortbemde
"No! This is a GOOD Samaritan!"
It would be like if, today, someone teaches a lesson by telling a story about a... about a... hold on... okay, we have to tread carefully here because casually referencing an offensive stereotype, even if we don't believe in it, might rub some people the wrong way. Let's pick a safe target: Florida Man.
It would be like if, today, someone teaches a lesson by telling a story about three men locked out of their homes. The first man, a priest, climbs up a drainpipe to an unlocked window, slips, and breaks his neck. The second man, a rabbi, drives his pickup truck straight through the closed garage door, causing much property damage in his quest to gain entry. But the third man is Florida Man, and despite what you'd think, he phones a locksmith and has his door opened professionally. This is the story of the Prudent Florida Man, a lesson that subverts our expectations.
As years go by, now imagine people start calling various prudent people "prudent Florida Man," and then simply "Florida Man," because that's what they now think “Florida Man” means. That means the parable does a hell of a good job at breaking the original Florida Man stereotype, breaking it so hard it's eventually forgotten. But it also forgets half the original message of Jesus' parable, which is "just in general, don't be racist."