Florian struck on the opener at Anfield before Marcus Edwards' strike for Burnley pegged them back.
Asked about the boos at fulltime, Slot remarked: "Yes, in my head it wasn’t a boo, but in my head it was frustration as well.
"We are Liverpool and we play against Burnley – and we have to give them credit (for) how they defended, cleared balls off the line, all the things you want to see if you are a Burnley manager, players that try to do everything to prevent us from scoring – but if we, as Liverpool, are not disappointed anymore by having a draw at home against Burnley then something is completely wrong.
"I completely understand the frustration. I can tell you I have the same and the players definitely have the same frustration as the fans have."
Slot also stated: "I think today was a game which I like to see, a team that even for our standards more ball possession than we usually have, generating a lot of chances from that ball possession. Usually if you take a bit more risk that comes with the other team counter-attacking you a few times and we controlled that really well.
"But in football one team can have two chances – there was almost an own goal from us – and score one goal and the other team can have multiple chances and score one goal as well and you get the result we got today."