weird ruling

[WutRUTryin2Hit]

I had a weird situation pop up at a casino tonight. Does anyone else play at a casino who would ever rule this way? I'm playing 1-2NL and a guy bets $20 into me on the flop. I say very clearly "raise" and then I cut out $20 in chips, put them halfway between me and "the line" and think about how much to raise, and then I go back to my stack and cut out $50 more in chips. I put the $50 over the line and then go to move the original $20 over the line too.

The dealer shouts "whoa, no!" and stops me. Over a long conversation with him and the floorman, they explain that if I had put the $20 over the line to begin with, that would be fine, I could go back for the $50. But once I put $50 over the line, I can't go back for more, because $50 is more than the original bet. The dealer was really condescending and kept going "buddy, I see people do this every day, trust me, I'm here everyday, you're not".

I kept telling him that when I say raise verbally, I could go back to my stack 50 times if I wanted and keep adding chips 1 by 1, but he argued that no, that was only in tournaments, not cash games.

Seriously, does ANYWHERE really have this rule??