He said his actions came as he tried to protect his family presumably from the photographer but were unacceptable and undermine "hard-fought rights that I vigorously support."
The video, which was posted on TMZ, also drew a tweeted apology from Baldwin in which he claimed he was unaware the term he used was offensive to gays.
MSNBC declined further comment. Baldwin's representative said in an email Friday night that the actor would decline to comment.
The incident came during the week a Canadian actress was convicted in New York of stalking Baldwin with calls, emails and visits over a two-year period. Genevieve Sabourin was sentenced to six months in jail in addition to a month she's already serving for her courtroom outbursts.
Baldwin reportedly lost his cool again Friday when a reporter for a New York TV channel asked about the trial and, according to Variety.com, Baldwin called him "dumb." The exchange took place outside Baldwin's apartment building, the website said.
Baldwin is also known for his temper. He was kicked off a plane in 2011 after refusing to stop playing a cellphone game, and he's gotten into confrontations with news photographers. He and a New York Post photographer filed harassment complaints against each other after an altercation in February, and a Daily News photographer said Baldwin punched him in 2012, which Baldwin denied.