Horsham joint-manager Anthony Storey called for more discipline after Tuesday’s sending-off cost them two points.
A 95th minute goal by the visitors forced a 2-2 draw with Tooting & Mitcham.
Their cause was not helped when winger Tony Nwachukwu was booked for kicking the ball away and was then sent-off in the 84th minute for his second yellow card.
The last challenge led to Tooting’s Saidou Khan being stretchered off and the rest of the team facing a barrage of late pressure. Stefan Cox ran in unchallenged and struck a low equaliser from 20 yards.
Disappointed Storey said: “Tony’s sending-off came back to haunt us.
“We’ve got to be more professional and more disciplined than that, allround.
“They were always going to pressure us with us going down to ten men and in the end we were probably lucky to get a point.”