Per your description, he wasn't armed and he wasn't robbing you. Obviously, if he is robbing you, that changes everything and your conduct is justified.
Assuming it was not robbery, the following could apply:
Sec. 46.035. UNLAWFUL CARRYING OF HANDGUN BY LICENSE HOLDER. (a) A license holder commits an offense if the license holder carries a handgun on or about the license holder's person under the authority of Subchapter H, Chapter 411, Government Code, and intentionally fails to conceal the handgun.
Sec. 22.01. ASSAULT. (a) A person commits an offense if the person:
...
(2) intentionally or knowingly threatens another with imminent bodily injury, including the person's spouse; or
Sec. 22.02. AGGRAVATED ASSAULT. (a) A person commits an offense if the person commits assault as defined in Sec. 22.01 and the person:
...
(2) uses or exhibits a deadly weapon during the commission of the assault.
Sec. 22.05. DEADLY CONDUCT. (a) A person commits an offense if he recklessly engages in conduct that places another in imminent danger of serious bodily injury.
...
(c) Recklessness and danger are presumed if the actor knowingly pointed a firearm at or in the direction of another whether or not the actor believed the firearm to be loaded.
Sec. 22.07. TERRORISTIC THREAT. (a) A person commits an offense if he threatens to commit any offense involving violence to any person or property with intent to:
...
(2) place any person in fear of imminent serious bodily injury;
Painting him with the laser could be considered an additional, separate count of ASSAULT or TERRORISTIC THREAT.
Glad you weren't charged with anything, but in general I am careful about not actually pulling a gun on someone unless I am justified in shooting them. I know of multiple cases where CHL's who displayed a weapon without the justification to shoot ending up being convicted of assault. Especially road rage cases.
Parking lot interactions like you describe are often simply begging for money (which does not justify deadly force), and they are often an "interview" while the guy gets ready to rob you (whereas a robbery does justify deadly force), so the situation appears to be ambiguous. If you had been charged, then you are going to need to be convincing that it was a robbery.