O'Sullivan recently hit the headlines for branding lower-ranked professionals "numpties" and has followed it up this week by suggesting the majority of players in the modern game lack the "bottle" required to win multiple titles.
O'Sullivan, whose tally of 31 career ranking titles is second only to Stephen Hendry, believes that with the exception of "four or five players", most "get a bit flaky under the cosh" and are "clueless".
Selby, the reigning and three-time World Champion, responded to The Rocket's remarks after his Quarter-Final win over Michael White in the Ladbrokes World Grand Prix on Friday.
"I read what he said, it was probably a bit harsh on some of the other players he's not mentioned," Selby told ITV Sport.
"Obviously your Robertsons and your Murphys are Triple Crown winners so it's a bit harsh on them.
"To be fair, Ronnie's 42 years old and probably playing as good now as he's ever done.
"Similar to Federer in tennis, he's getting better with age which is worrying for all of us."
O'Sullivan was in scintillating form on Thursday as he whitewashed Xiao Guodong 5-0 with the aid of four century breaks to reach the Semi-Finals in Preston.
He remains on a collision course with rival Selby for a potential show-down in Sunday's final and Selby admits he would relish the challenge.
"I was practicing so I didn't watch any of it but when it got to the interval at four-nil, the stats came on the TV in the practice room of his pot success rate at 99 per cent and I was like 'jesus'.
"Two minutes later he's in the practice room himself so I'm thinking he's probably looking for that extra one per cent somewhere!
"If I win the Semi-Final and Ronnie wins and he carries on playing like that, I'd prefer that because I know if I go out there and carry on playing like I am then I've got no chance so I know where I stand."
Selby has endured a season of mixed fortunes, winning the International Championship last October while suffering early exits in the UK Championship and Masters.
The Leicester ace was far from at his best in a 5-2 win over White on Friday afternoon and says he is struggling to identify what the issue is.
"It's more just frustration than anything else because I'm playing well on the practice table, cueing well, but I'm going out there and it's just not happening.
"Any shot over six foot I'm not even timing it and just cueing across it.
"I just can't put my finger on what it is.
"But you'd rather be playing like that and still be in the tournament than play really well and be going home.
"I take pride in my performance and I'm not happy with the way I performed there," he added.
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