I tell some guy I'm colluding. Is this OK?

[RoundTower]

I had a funny experience last week playing a small stakes tourney on Pokerstars.

I don't have the HH or the chat transcript, but some time in the middle of the tournament we play this hand. Fishy limps in MP, I raise on the button with K4o, BB who has 1.5BB in total calls, and fishy folds. BB wins the pot.

After the hand fishy asks "why the raise?" "moron". I don't tap the glass. I say "BB is my buddy", "I don't want him knocked out at this stage of the tourney". Fishy jumps on me and tells me I am colluding and cheating. I'm having too much fun stirring the sh:t at this point and tell him "it's hardly cheating to help a buddy out". He threatens to tell Stars support. A third player chimes in and tells me "RoundTower in future I wouldn't mention that in public".

This went on for quite a while. I'd post the chat transcript if I had it.

Am I being a dick here or is this harmless fun?