John Stamos was "shocked" by the backlash he received for wearing a bald cap to visit Dave Coulier

Speaking to TMZ, John said: "He wanted me to come shave his head. I knew before, so I brought the bald cap from the studio."

The 'Big Shot' actor wasn't able to actually shave his own head in solidarity because of contractual obligations.

He added: "Regardless, I'm so shocked. First I'll say, I'm just embarrassed and they're embarrassing.

"But when I started seeing this blowback, I'm just like, 'What?' I couldn't figure it out. I still don't know 100%.

"What they should be doing instead of making silly little videos, or doing comments - they should call their doctor, make an appointment. I think that's the whole point of this. It's been Dave's message."

Though John normally isn't concerned with online criticism, he admitted he was "hurt" by the backlash because he just wanted to be there to support his friend through a hard time.

He said: "I don't look at stuff [online]. I swear most of the time I don't, but this one really hurt me mainly because I didn't understand it.

"But the point is that I'm embarrassed for people that they waste time on this when all I was doing was cheering up a friend, and I'm sorry - I started to say 'I'm sorry,' I'm not sorry."

The pair enjoyed their meeting.

John said: "He cried, we laughed, we watched old movies and we told stories and I brought videos and it just was a beautiful thing."

Dave previously defended his pal against the criticism and insisted he "laughed out loud" when he came to visit.

He wrote on Instagram earlier this week: "I'm sorry to see a bunch of negative comments as I've just begun my cancer journey.

"It's our friendship (me and John) and this is how we are handling a very tough time. I'm a comedian and humor is what drives me. John knows how to cheer me up and I laughed out loud when he arrived wearing a bald cap - being a true loving friend and brother.(sic)"