Best went down under a challenge in the box from Richard Dunne in the 35th minute at Hillsborough, despite contact looking minimal at best, and the Rangers defender was dismissed.
The Owls scored the resulting penalty and then went on to boss matters, with Best adding a second after the break and Lewis Buxton completing the win.
"I was through and I was going to hit it with my left and I just thought I'd take another touch and get in front of him," Best said after the game.
"He clipped my right knee and it took me down. I probably could have got the ball but I wouldn't have been able to score.
"There was definite contact, I am not a diver, I try and stay on my feet. Plus he's a friend from the Republic of Ireland squad.
"That's football, if I tried to stay on my feet and didn't score it then it could be a different game.
"I was surprised with the red but that is football, he was the last man, they are the rules."
The 27-year-old, on loan from Blackburn, netted his third goal for the Owls and after an injury-laden spell at Ewood Park, he is enjoying being back on the pitch.
"I have not played a lot of football for a long, long time," he added. "I have come here to get games, get fit and get back scoring.
"It was a frustrating time at Blackburn not playing and I thank Stuart for the chance.
"It was hard at first, getting back into it and playing games when you're nowhere near fit."
However, with his loan up at the end of the season, Best was coy on his future.
"I'd like to carry on playing 90 minutes, scoring goals and getting no injuries," he said.