Ralls was dismissed for a cynical challenge on Lucas Moura in a bad-tempered game at Wembley.
He hacked down the Brazilian as he turned on the jets on the right flank, without making any attempt to win the ball.
Kane grabbed hold of Ralls in the aftermath of the incident and Warnock indicated that the England striker got the Cardiff player sent off.
It doesn't take a lip-reading expert to work out what Warnock was screaming to Kane.
After referee Mike Dean had brandished a red card, Warnock was caught by television cameras sarcastically clapping and saying "F****** well done Harry".
As reported by Cardiff City Online, Warnock said: 'Why not give Harry Kane a red? He went in and pushed him [Ralls] didn't he? He doesn't need to do that. He (Kane) is doing that to make an issue of it, to get the referee thinking (it was) worse than what it is. "We fully deserved the victory and the three points and in the end that's the most important thing because it keeps us in a very good position in the table, one point off the top". He's the England captain for goodness sake.
Spurs triumphed 1-0 thanks to Eric Dier's eighth-minute goal but did so in front of an official attendance of 43,268 - some way short of the national stadium's 90,000-seat capacity. We need to kill the games, have more control, more calm when you play at home. I think we need to improve a lot in our performance.
"The effort was fantastic and it was not easy after the defeat against Barcelona to be ready again to compete, but I think we competed well".
"I think if he'd gone with his gut instinct he would have given a yellow card because that's what he was going to".
'He was determined to score today because we're the only Premier League side he's not scored against, but I thought our centre-backs handled him well'.