Speaking on his RTÉ Radio One show on Wednesday morning, Ryan Tubridy hailed the "indomitable Irish spirit" and the care and compassion people are showing towards each other.
He said listeners "want to share good news in what is essentially a dark time".
Reflecting on an "extraordinary St Patrick's Day", the presenter said: "What I saw yesterday was this beautiful, indomitable Irish spirit.
"I saw children with green paint on their faces and green hats and bobbins and bobbles and anything they could get their hands on. They were these little micro-parades of the mind as children and their families persisted in going green.
"I saw Irish flags hanging out windows. I saw just a sense of the country everywhere and people ploughing on, and it was lovely.
"I heard of people calling to their grandparents and knocking at the window and looking through the window and maybe having a song or a dance or to say hello. And that is weird and that is not normal so it's ok, because abnormal is the new normal for the moment."
"I find myself having no tolerance for people giving out and complaining or being nasty," he continued.
"We have to be much more mindful of each other's space and mindset, and that's what's so good about it.
"The decency domino continues to fall and let's keep it that way. It's a beautiful thing, and I love it."