The former motocross racer has been accompanying his wife and their two children - Jameson, 20 months, and Willow, 7, on the road for the musician's Beautiful Trauma tour.
Taking to his Instagram account, Hart shared: 'Wanna know how glamorous tour can be? Jameson has hand, foot, and mouth; and willow has a 102 temp. Both kids laid up and mama @pink still has to push through and do shows.'
The 43-year-old father-of-two then shared a picture of Jameson covered in a rash and Willow sitting in a bath.
Hart added, 'I had Jameson at breakfast yesterday and this vile woman at the table next to us kept staring at him with a sh***y look on her face.'
Fans quickly flocked to the post to criticise the athlete for taking his son out and exposing him to others.
'Pink I love you but why would you take him to breakfast looking like that? People don’t know what is going on for all they know he has something contagious so it’s only human to be grossed out or at least concerned,' one wrote.
Another echoed, 'As a mum of 3 whose kids have had HFM a few times, I say that you made a mistake. HFM is super contagious and it’s not fair to knowingly expose others. I don’t think it’s fair to pass judgment on the other patron. She likely was concerned for her own safety as well and probably concerned about your son.'
Hart wrote in response to the first, 'Are you serious???? You are what’s wrong with this judgmental world.'
He also responded sarcastically to one user who questioned him about his son only wearing a diaper to breakfast.
'Yeah I took my kid to breakfast only wearing a diaper,' he said.
Hart also responded to another who commented about the condition’s contagious nature, 'What’s your point? You think I let my kids eat off other people’s plates?'
Earlier in the week Hart also shared another glimpse into how 'glamorous' tour life can be.
Sharing a photo to Instagram, Hart shared a snap of himself on the toilet with Jameson at his feet and Willow and Pink at the door.
He captioned, 'Dude, can I just take a sh*t?? Family meetings always have to happen when I’m pissing off IG 😂'.
This article originally appeared on New Idea.