Norwich goalkeeper Ruddy is one of two understudies to Hart in the squad, alongside Celtic's uncapped stopper Fraser Forster, for the crucial World Cup qualifiers with Montenegro and Poland as England bid to advance to next summer's tournament in Brazil.
If Sunday's Barclays Premier League match with Chelsea was an opportunity to audition for the number one role, for Ruddy it did not go entirely to plan as Eden Hazard's shot squirmed under his body and he was less than convincing under the high ball, albeit in no small part due to the Norfolk sunshine.
But Ruddy, whose single England appearance to date came in a friendly win over Italy, for now has no pretensions on the England goalkeeper jersey he believes Hart fully deserves.
"Joe's the England number one. Rightly so," Ruddy said.
"The way he's performed over the last few years he's deserved it and he's never let England down.
"I've been in situations before when people are questioning you. It's never nice.
"Without being too patronising, I felt sorry for him.
"He doesn't warrant that sort of attention. He's a top-drawer goalkeeper, one of the best in the world without a shadow of a doubt.
"It's the way the media is - you build people up so far and then chop their legs away when they get too high.
"Unfortunately that's the way the English media goes. Until that stops we might struggle to go anywhere in competitions."
Nevertheless, Ruddy believes Hart, like any top-level goalkeeper, has the mental resilience to put errors behind him.
"Nine times out of 10 a keeper makes a mistake, the ball goes in the back of the net," Ruddy said.
"It's a tough world but every keeper is mentally strong enough to deal with that.
"We're a strange bunch, but you have to be. The self-confidence and self-belief that you have as an individual has to be right up there."
Ruddy insists there are plenty of goalkeepers pushing Hart for his position, should England boss Roy Hodgson opt to change.
The 26-year-old said: "There's plenty of talent around. Joe knows that. Joe sets himself very high standards.
"I'm looking forward to working with him for the rest of the week.
"I'm happy to be involved in the squad and I'm happy to be putting pressure on Joe. He knows there's myself, there's Fraser, there's Ben (Foster), there's Jack (Butland), (and) Robert Green's kept eight clean sheets in a row - you don't do that if you're a bad keeper."