Bad Etiquette or Just Playing By The Rules?

[a1doug182]

I was playing 4-8 last night when I caught a 2nd nut flush on the river. My opponent had been aggressive to that point and bet the river, I in turn raised. When he went to call we went across the line with more chips than necessary and was forced to raise per the casino rules. I then proceeded to reraise even though I knew his intent was to just call. He then called showing his 2nd best hand of two pair. Is this considered bad etiquette or did I just maximize my winnings by useing this to my advantage?