Mourinho was booked by referee Mike Dean in the 77th minute after the Portuguese approached the Southampton bench.
"I clearly deserved the yellow card as I was rude," Mourinho was quoted as saying by ESPNFC after the game. "But I was rude to an idiot. Because I was rude I deserved the yellow card."
Tottenham lost to Southampton 0-1 in a contest that saw skipper Harry Kane limp off the pitch with an hamstring injury.
"It is negative, hamstring is always negative. Is it a tear, is it a small thing, is it a spasm, is it a contraction? At this moment I cannot say," Mourinho said of the injury.
Mourinho also complained that Tottenham should have been awarded a penalty for a foul on Dele Alli, also chastising the controversial VAR.
"For me, at this moment, the referees are not the referees. VAR should be called by video referees. Our (disallowed) goal I also don't know, but I confess that I didn't watch it yet.
"What I know is that the Dele Alli penalty was a penalty and the VAR didn't interfere. Then they interfered in the analysis of a penalty that from 75 yards away I knew was not a penalty.
"I think they gave the VAR analysis to try to make us blind about the penalty that was a penalty. They decide not even to analyse on the VAR. This is going in a very bad direction," Mourinho said.
Tottenham remain on 30 points, six behind fourth-placed Chelsea, in the Premier League standings.
( With inputs from IANS )