A tip that was not well received.

[FTX I]

I've always been worried about tips in NY and I always try to be generous, but in Europe I never cared that much until a couple years ago. However, as time goes by and I'm tipping more and more over there too, leaving notes and tips for the cleaning staff at the apartment I rent, tipping at bars, restaurants etc, but this particular time I had to deal with a strange reaction.

I was at my usual destination some weeks ago having drinks etc and had to use the restroom while walking in the city center. Wife said there's a McDonalds over there, so I went and the cost was 50 cents. I had two coins in my pocket, 2 euros each. The lady at the door said to me we don't have change. I said no problem, gave her two coins, 4 euros, and said you can keep the change. I thought it was a nice gesture tipping someone responsible for a public toilet, but apparently it was a mistake. She looked at me and said oohh I'm rich right now and laughed. Well, I know the tip was not much money, but it was 8x the service cost, so I don't think I was offending anyone.

Just need to say I'm not complaining here and I was not sad or anything so no one needs to feel sorry for me lol but it was a bit weird. I'm not sure I should stop worrying that much about tipping in Europe or it was just someone having a bad day. Thoughts?