"I was in a good mood at the time so I didn't retaliate or say anything," Nathan told the Herald. "I was just like 'oh, okay bro, that's all good; you're entitled to your own opinion and that's fine and that was it … and I woke up the next day and I was kinda like 'man, it sucks!'
"It's pretty sad for someone like me... I might not be perfect at speaking the reo but I definitely try my hardest and I don't think I butcher it that often, so to hear someone who's fluent and knows how to speak knock you down is not very supportive."
More than 300 people have reacted to the Facebook post and 60 people have left comments, many of them supporting Nathan for speaking out.
Had a prominent māori actor pull me aside on the weekend & tell me that I shouldn’t speak te reo on the radio because it...
Posted by Astley Nathan on Monday, 24 June 2019
Nathan, who grew up in Auckland, says no one in his family spoke te reo but he attended kohanga reo, studied Māori at high school and Māori media at AUT.
He admits learning the language is an ongoing journey for him but he worries others trying to learn could be discouraged by negative comments such as the one he received.
"I'm definitely proud of my culture and I'm proud to be Māori, but I do feel shy when I have to speak Māori or say my pepeha or try and hold a conversation with someone who speaks Māori."
Nathan says he's not interested in naming the man who criticised him but wanted to speak out in support of others who may have had similar experiences.
"I want people who are in a similar boat to me who have had similar experiences with people that feel like they haven't spoken correctly, or have been put down for not speaking Māori correctly, to feel encouraged and feel supported and know there are other people out there that have dealt with that.
"If anything, we as Māori are our own worst critics. Māori are very harsh towards other Māori in terms of the reo, so for me I just wanted to put that out there and hopefully make people feel supported.
"Bottom line: whether you're fluent, whether you're just starting to learn, whether you're half way through your journey – if we want [te reo] to survive and want it to flourish, we all need to support each other."