Why did security stop me for no reason?

So today i went to my local electronic store to see if they had anything cheap on sale. So i walked in and i didn't stay for long i just go to the clearance and iPhone area to find nothing cheap is on sale. So then i left its was like 4:45pm and after i left the store parking lot(i was walking) the store security ran after me for no reason. He told me to show him what's in my pocket so i did(all i had was my phone, key, wallet). Then he said sorry and let me go but didn't tell me why I'm stop. I didn't steal anything i was just looking around in the store. Did he stop me because I stayed too short and they though i went it to steal something? Or why did he stop me for?

Probably because your young. I would of filed complaint with store, mall, corporate. Then I would go home and carpet bomb internet with experience.

Unfortunately, this happens a lot. It could be someone told the security guard that he/she saw you take something, or the way you were dressed, age or race. If you feel you were discriminated again, by all means file a complaint, and seek a lawyers advice.

He stopped you because he thought you stole something. When he found out you had no store merchandise he apologized and left. He acted properly. It would have been nice to explain but he was not obligated to explain. Store management may have wisely told the security people "Don't explain, just say 'Sorry' and leave." Explanations can lead to arguments about whether the explanation was false or unreasonable or insulting. Better to avoid that discussion.

This answer must not be relied on as legal advice for the reasons posted here:
http://mayan89.blogspot.com. And I'm not your attorney.