A brace from Paddy Madden sent the Dons - who beat QPR in the FA Cup on Saturday - to their first defeat in 2013, with goalscorer Kay dismissed in the second half for an off-the-ball clash with Madden.
He said: "The lad has turned around and ran at Antony Kay and went down holding his face. I got told by an official that my players and I are maybe too honest. Luckily for us, we have got the video footage of all the incidents.
"How many times has something like that happened to us this year? We don't dive, we don't go to ground and we don't feign injury. We try to conduct ourselves in the right way. The pitch was a shambles, but both teams had to play on it so fair play to Yeovil. On the back of the physical game at QPR it really took it out of us.
"We weren't great and we weren't at our best, but thanks to the fans for showing their support and for coming along. In the first 20 minutes we looked lethargic, lazy and disorganised, and that's not how we play".
Yeovil boss Gary Johnson hailed his team's win and was delighted to see the Glovers move within touching distance of the npower League One playoffs.
He said: "we knew that if we could get the game on then we would be up for it.
"It was a big game and we knew that whichever side lost would be very disappointed. We knew that if it could go ahead and we got a positive result, we would find ourselves like a cat amongst pigeons in the top seven or eight.
"We're getting closer to where we want to be. Of course I wanted the game on as we're the home team, but to be fair, Karl Robinson also wanted it on. The referee quite rightly waited a little while to check it was safe, but we all decided to start it and credit to both sets of players. If you walk out there now the pitch looks unbelievable.
"It's absolutely great to have Paddy Madden around - he is an infectious runner, he has a bit of Irish blood in him, and is a great finisher. He shows that week in, week out for us".
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- Paddy Madden