Berating the fishy

I has a funny story. I was at the table the other night and an older gentleman who seemed new got into a hand with me. Well, long story short, he flopped top set and I flopped an OESFD (open-ended straight flush draw). He checked, I shoved (15 outs good right?). He called looked surprised when I turned over my hand. I don't know the numbers, but I think I was a slim lead (I could be wrong). Anyway, I "sucked out" a flush and he let me have it! I just sat there for a few minutes taking it as best I could. A little while later, he said he wanted his money back. LAWL. I kinda chuckled and said, "Well then you're gonna have to have me miss my suckout then!" The table roared with laughter!